diff --git a/app/javascript/flavours/glitch/components/status_action_bar.jsx b/app/javascript/flavours/glitch/components/status_action_bar.jsx
index 16a8e44307..8d32c6b5d7 100644
--- a/app/javascript/flavours/glitch/components/status_action_bar.jsx
+++ b/app/javascript/flavours/glitch/components/status_action_bar.jsx
@@ -31,7 +31,7 @@ const messages = defineMessages({
   reblog_private: { id: 'status.reblog_private', defaultMessage: 'Boost with original visibility' },
   cancel_reblog_private: { id: 'status.cancel_reblog_private', defaultMessage: 'Unboost' },
   cannot_reblog: { id: 'status.cannot_reblog', defaultMessage: 'This post cannot be boosted' },
-  favourite: { id: 'status.favourite', defaultMessage: 'Favourite' },
+  favourite: { id: 'status.favourite', defaultMessage: 'Favorite' },
   bookmark: { id: 'status.bookmark', defaultMessage: 'Bookmark' },
   open: { id: 'status.open', defaultMessage: 'Expand this status' },
   report: { id: 'status.report', defaultMessage: 'Report @{name}' },
diff --git a/app/javascript/flavours/glitch/components/status_prepend.jsx b/app/javascript/flavours/glitch/components/status_prepend.jsx
index 9b2bcc8ea1..31e84c6e11 100644
--- a/app/javascript/flavours/glitch/components/status_prepend.jsx
+++ b/app/javascript/flavours/glitch/components/status_prepend.jsx
@@ -55,7 +55,7 @@ export default class StatusPrepend extends PureComponent {
       return (
         <FormattedMessage
           id='notification.favourite'
-          defaultMessage='{name} favourited your status'
+          defaultMessage='{name} favorited your status'
           values={{ name : link }}
         />
       );
diff --git a/app/javascript/flavours/glitch/containers/status_container.js b/app/javascript/flavours/glitch/containers/status_container.js
index 1f4b982add..03714ce050 100644
--- a/app/javascript/flavours/glitch/containers/status_container.js
+++ b/app/javascript/flavours/glitch/containers/status_container.js
@@ -47,7 +47,7 @@ const messages = defineMessages({
   deleteConfirm: { id: 'confirmations.delete.confirm', defaultMessage: 'Delete' },
   deleteMessage: { id: 'confirmations.delete.message', defaultMessage: 'Are you sure you want to delete this status?' },
   redraftConfirm: { id: 'confirmations.redraft.confirm', defaultMessage: 'Delete & redraft' },
-  redraftMessage: { id: 'confirmations.redraft.message', defaultMessage: 'Are you sure you want to delete this status and re-draft it? Favourites and boosts will be lost, and replies to the original post will be orphaned.' },
+  redraftMessage: { id: 'confirmations.redraft.message', defaultMessage: 'Are you sure you want to delete this status and re-draft it? Favorites and boosts will be lost, and replies to the original post will be orphaned.' },
   replyConfirm: { id: 'confirmations.reply.confirm', defaultMessage: 'Reply' },
   replyMessage: { id: 'confirmations.reply.message', defaultMessage: 'Replying now will overwrite the message you are currently composing. Are you sure you want to proceed?' },
   editConfirm: { id: 'confirmations.edit.confirm', defaultMessage: 'Edit' },
diff --git a/app/javascript/flavours/glitch/features/account/components/header.jsx b/app/javascript/flavours/glitch/features/account/components/header.jsx
index 05a4e3844d..c956834776 100644
--- a/app/javascript/flavours/glitch/features/account/components/header.jsx
+++ b/app/javascript/flavours/glitch/features/account/components/header.jsx
@@ -46,7 +46,7 @@ const messages = defineMessages({
   pins: { id: 'navigation_bar.pins', defaultMessage: 'Pinned posts' },
   preferences: { id: 'navigation_bar.preferences', defaultMessage: 'Preferences' },
   follow_requests: { id: 'navigation_bar.follow_requests', defaultMessage: 'Follow requests' },
-  favourites: { id: 'navigation_bar.favourites', defaultMessage: 'Favourites' },
+  favourites: { id: 'navigation_bar.favourites', defaultMessage: 'Favorites' },
   lists: { id: 'navigation_bar.lists', defaultMessage: 'Lists' },
   followed_tags: { id: 'navigation_bar.followed_tags', defaultMessage: 'Followed hashtags' },
   blocks: { id: 'navigation_bar.blocks', defaultMessage: 'Blocked users' },
diff --git a/app/javascript/flavours/glitch/features/compose/components/action_bar.jsx b/app/javascript/flavours/glitch/features/compose/components/action_bar.jsx
index f155979ef9..ff7d4d03dc 100644
--- a/app/javascript/flavours/glitch/features/compose/components/action_bar.jsx
+++ b/app/javascript/flavours/glitch/features/compose/components/action_bar.jsx
@@ -14,7 +14,7 @@ const messages = defineMessages({
   pins: { id: 'navigation_bar.pins', defaultMessage: 'Pinned posts' },
   preferences: { id: 'navigation_bar.preferences', defaultMessage: 'Preferences' },
   follow_requests: { id: 'navigation_bar.follow_requests', defaultMessage: 'Follow requests' },
-  favourites: { id: 'navigation_bar.favourites', defaultMessage: 'Favourites' },
+  favourites: { id: 'navigation_bar.favourites', defaultMessage: 'Favorites' },
   lists: { id: 'navigation_bar.lists', defaultMessage: 'Lists' },
   followed_tags: { id: 'navigation_bar.followed_tags', defaultMessage: 'Followed hashtags' },
   blocks: { id: 'navigation_bar.blocks', defaultMessage: 'Blocked users' },
diff --git a/app/javascript/flavours/glitch/features/explore/statuses.jsx b/app/javascript/flavours/glitch/features/explore/statuses.jsx
index 33a00a50b1..b6cb083072 100644
--- a/app/javascript/flavours/glitch/features/explore/statuses.jsx
+++ b/app/javascript/flavours/glitch/features/explore/statuses.jsx
@@ -47,7 +47,7 @@ class Statuses extends PureComponent {
     return (
       <>
         <DismissableBanner id='explore/statuses'>
-          <FormattedMessage id='dismissable_banner.explore_statuses' defaultMessage='These are posts from across the social web that are gaining traction today. Newer posts with more boosts and favourites are ranked higher.' />
+          <FormattedMessage id='dismissable_banner.explore_statuses' defaultMessage='These are posts from across the social web that are gaining traction today. Newer posts with more boosts and favorites are ranked higher.' />
         </DismissableBanner>
 
         <StatusList
diff --git a/app/javascript/flavours/glitch/features/favourited_statuses/index.jsx b/app/javascript/flavours/glitch/features/favourited_statuses/index.jsx
index ed11f2b8ce..9c745be813 100644
--- a/app/javascript/flavours/glitch/features/favourited_statuses/index.jsx
+++ b/app/javascript/flavours/glitch/features/favourited_statuses/index.jsx
@@ -18,7 +18,7 @@ import Column from 'flavours/glitch/features/ui/components/column';
 import { getStatusList } from 'flavours/glitch/selectors';
 
 const messages = defineMessages({
-  heading: { id: 'column.favourites', defaultMessage: 'Favourites' },
+  heading: { id: 'column.favourites', defaultMessage: 'Favorites' },
 });
 
 const mapStateToProps = state => ({
@@ -74,7 +74,7 @@ class Favourites extends ImmutablePureComponent {
     const { intl, statusIds, columnId, multiColumn, hasMore, isLoading } = this.props;
     const pinned = !!columnId;
 
-    const emptyMessage = <FormattedMessage id='empty_column.favourited_statuses' defaultMessage="You don't have any favourite posts yet. When you favourite one, it will show up here." />;
+    const emptyMessage = <FormattedMessage id='empty_column.favourited_statuses' defaultMessage="You don't have any favorite posts yet. When you favorite one, it will show up here." />;
 
     return (
       <Column bindToDocument={!multiColumn} ref={this.setRef} name='favourites' label={intl.formatMessage(messages.heading)}>
diff --git a/app/javascript/flavours/glitch/features/favourites/index.jsx b/app/javascript/flavours/glitch/features/favourites/index.jsx
index a5f21e577e..2b36945eee 100644
--- a/app/javascript/flavours/glitch/features/favourites/index.jsx
+++ b/app/javascript/flavours/glitch/features/favourites/index.jsx
@@ -71,7 +71,7 @@ class Favourites extends ImmutablePureComponent {
       );
     }
 
-    const emptyMessage = <FormattedMessage id='empty_column.favourites' defaultMessage='No one has favourited this post yet. When someone does, they will show up here.' />;
+    const emptyMessage = <FormattedMessage id='empty_column.favourites' defaultMessage='No one has favorited this post yet. When someone does, they will show up here.' />;
 
     return (
       <Column ref={this.setRef}>
diff --git a/app/javascript/flavours/glitch/features/getting_started_misc/index.jsx b/app/javascript/flavours/glitch/features/getting_started_misc/index.jsx
index 20dfe80b47..d7500fd822 100644
--- a/app/javascript/flavours/glitch/features/getting_started_misc/index.jsx
+++ b/app/javascript/flavours/glitch/features/getting_started_misc/index.jsx
@@ -15,7 +15,7 @@ import ColumnSubheading from 'flavours/glitch/features/ui/components/column_subh
 const messages = defineMessages({
   heading: { id: 'column.heading', defaultMessage: 'Misc' },
   subheading: { id: 'column.subheading', defaultMessage: 'Miscellaneous options' },
-  favourites: { id: 'navigation_bar.favourites', defaultMessage: 'Favourites' },
+  favourites: { id: 'navigation_bar.favourites', defaultMessage: 'Favorites' },
   blocks: { id: 'navigation_bar.blocks', defaultMessage: 'Blocked users' },
   domain_blocks: { id: 'navigation_bar.domain_blocks', defaultMessage: 'Blocked domains' },
   mutes: { id: 'navigation_bar.mutes', defaultMessage: 'Muted users' },
diff --git a/app/javascript/flavours/glitch/features/interaction_modal/index.jsx b/app/javascript/flavours/glitch/features/interaction_modal/index.jsx
index c9bbecf1af..97cd41b473 100644
--- a/app/javascript/flavours/glitch/features/interaction_modal/index.jsx
+++ b/app/javascript/flavours/glitch/features/interaction_modal/index.jsx
@@ -116,8 +116,8 @@ class InteractionModal extends PureComponent {
       break;
     case 'favourite':
       icon = <Icon id='star' />;
-      title = <FormattedMessage id='interaction_modal.title.favourite' defaultMessage="Favourite {name}'s post" values={{ name }} />;
-      actionDescription = <FormattedMessage id='interaction_modal.description.favourite' defaultMessage='With an account on Mastodon, you can favourite this post to let the author know you appreciate it and save it for later.' />;
+      title = <FormattedMessage id='interaction_modal.title.favourite' defaultMessage="Favorite {name}'s post" values={{ name }} />;
+      actionDescription = <FormattedMessage id='interaction_modal.description.favourite' defaultMessage='With an account on Mastodon, you can favorite this post to let the author know you appreciate it and save it for later.' />;
       break;
     case 'follow':
       icon = <Icon id='user-plus' />;
@@ -158,7 +158,7 @@ class InteractionModal extends PureComponent {
 
           <div className='interaction-modal__choices__choice'>
             <h3><FormattedMessage id='interaction_modal.on_another_server' defaultMessage='On a different server' /></h3>
-            <p><FormattedMessage id='interaction_modal.other_server_instructions' defaultMessage='Copy and paste this URL into the search field of your favourite Mastodon app or the web interface of your Mastodon server.' /></p>
+            <p><FormattedMessage id='interaction_modal.other_server_instructions' defaultMessage='Copy and paste this URL into the search field of your favorite Mastodon app or the web interface of your Mastodon server.' /></p>
             <Copypaste value={url} />
           </div>
         </div>
diff --git a/app/javascript/flavours/glitch/features/keyboard_shortcuts/index.jsx b/app/javascript/flavours/glitch/features/keyboard_shortcuts/index.jsx
index 14d483212e..c12368ac09 100644
--- a/app/javascript/flavours/glitch/features/keyboard_shortcuts/index.jsx
+++ b/app/javascript/flavours/glitch/features/keyboard_shortcuts/index.jsx
@@ -61,7 +61,7 @@ class KeyboardShortcuts extends ImmutablePureComponent {
               </tr>
               <tr>
                 <td><kbd>f</kbd></td>
-                <td><FormattedMessage id='keyboard_shortcuts.favourite' defaultMessage='to favourite' /></td>
+                <td><FormattedMessage id='keyboard_shortcuts.favourite' defaultMessage='to favorite' /></td>
               </tr>
               <tr>
                 <td><kbd>b</kbd></td>
diff --git a/app/javascript/flavours/glitch/features/notifications/components/column_settings.jsx b/app/javascript/flavours/glitch/features/notifications/components/column_settings.jsx
index 937d01b46a..63e03c65f1 100644
--- a/app/javascript/flavours/glitch/features/notifications/components/column_settings.jsx
+++ b/app/javascript/flavours/glitch/features/notifications/components/column_settings.jsx
@@ -110,7 +110,7 @@ export default class ColumnSettings extends PureComponent {
         </div>
 
         <div role='group' aria-labelledby='notifications-favourite'>
-          <span id='notifications-favourite' className='column-settings__section'><FormattedMessage id='notifications.column_settings.favourite' defaultMessage='Favourites:' /></span>
+          <span id='notifications-favourite' className='column-settings__section'><FormattedMessage id='notifications.column_settings.favourite' defaultMessage='Favorites:' /></span>
 
           <div className='column-settings__pillbar'>
             <PillBarButton disabled={browserPermission === 'denied'} prefix='notifications_desktop' settings={settings} settingPath={['alerts', 'favourite']} onChange={onChange} label={alertStr} />
diff --git a/app/javascript/flavours/glitch/features/notifications/components/filter_bar.jsx b/app/javascript/flavours/glitch/features/notifications/components/filter_bar.jsx
index 99ce167496..7f4df1d92d 100644
--- a/app/javascript/flavours/glitch/features/notifications/components/filter_bar.jsx
+++ b/app/javascript/flavours/glitch/features/notifications/components/filter_bar.jsx
@@ -7,7 +7,7 @@ import { Icon } from 'flavours/glitch/components/icon';
 
 const tooltips = defineMessages({
   mentions: { id: 'notifications.filter.mentions', defaultMessage: 'Mentions' },
-  favourites: { id: 'notifications.filter.favourites', defaultMessage: 'Favourites' },
+  favourites: { id: 'notifications.filter.favourites', defaultMessage: 'Favorites' },
   boosts: { id: 'notifications.filter.boosts', defaultMessage: 'Boosts' },
   polls: { id: 'notifications.filter.polls', defaultMessage: 'Poll results' },
   follows: { id: 'notifications.filter.follows', defaultMessage: 'Follows' },
diff --git a/app/javascript/flavours/glitch/features/picture_in_picture/components/footer.jsx b/app/javascript/flavours/glitch/features/picture_in_picture/components/footer.jsx
index 7d5c4adb6f..720ffb3a70 100644
--- a/app/javascript/flavours/glitch/features/picture_in_picture/components/footer.jsx
+++ b/app/javascript/flavours/glitch/features/picture_in_picture/components/footer.jsx
@@ -23,7 +23,7 @@ const messages = defineMessages({
   reblog_private: { id: 'status.reblog_private', defaultMessage: 'Boost with original visibility' },
   cancel_reblog_private: { id: 'status.cancel_reblog_private', defaultMessage: 'Unboost' },
   cannot_reblog: { id: 'status.cannot_reblog', defaultMessage: 'This post cannot be boosted' },
-  favourite: { id: 'status.favourite', defaultMessage: 'Favourite' },
+  favourite: { id: 'status.favourite', defaultMessage: 'Favorite' },
   replyConfirm: { id: 'confirmations.reply.confirm', defaultMessage: 'Reply' },
   replyMessage: { id: 'confirmations.reply.message', defaultMessage: 'Replying now will overwrite the message you are currently composing. Are you sure you want to proceed?' },
   open: { id: 'status.open', defaultMessage: 'Expand this status' },
diff --git a/app/javascript/flavours/glitch/features/status/components/action_bar.jsx b/app/javascript/flavours/glitch/features/status/components/action_bar.jsx
index e32f721efb..5d48224fb7 100644
--- a/app/javascript/flavours/glitch/features/status/components/action_bar.jsx
+++ b/app/javascript/flavours/glitch/features/status/components/action_bar.jsx
@@ -24,7 +24,7 @@ const messages = defineMessages({
   reblog_private: { id: 'status.reblog_private', defaultMessage: 'Boost with original visibility' },
   cancel_reblog_private: { id: 'status.cancel_reblog_private', defaultMessage: 'Unboost' },
   cannot_reblog: { id: 'status.cannot_reblog', defaultMessage: 'This post cannot be boosted' },
-  favourite: { id: 'status.favourite', defaultMessage: 'Favourite' },
+  favourite: { id: 'status.favourite', defaultMessage: 'Favorite' },
   bookmark: { id: 'status.bookmark', defaultMessage: 'Bookmark' },
   more: { id: 'status.more', defaultMessage: 'More' },
   mute: { id: 'status.mute', defaultMessage: 'Mute @{name}' },
diff --git a/app/javascript/flavours/glitch/features/status/containers/detailed_status_container.js b/app/javascript/flavours/glitch/features/status/containers/detailed_status_container.js
index da0d35cbab..3b2ea6c74c 100644
--- a/app/javascript/flavours/glitch/features/status/containers/detailed_status_container.js
+++ b/app/javascript/flavours/glitch/features/status/containers/detailed_status_container.js
@@ -35,7 +35,7 @@ const messages = defineMessages({
   deleteConfirm: { id: 'confirmations.delete.confirm', defaultMessage: 'Delete' },
   deleteMessage: { id: 'confirmations.delete.message', defaultMessage: 'Are you sure you want to delete this status?' },
   redraftConfirm: { id: 'confirmations.redraft.confirm', defaultMessage: 'Delete & redraft' },
-  redraftMessage: { id: 'confirmations.redraft.message', defaultMessage: 'Are you sure you want to delete this status and re-draft it? Favourites and boosts will be lost, and replies to the original post will be orphaned.' },
+  redraftMessage: { id: 'confirmations.redraft.message', defaultMessage: 'Are you sure you want to delete this status and re-draft it? Favorites and boosts will be lost, and replies to the original post will be orphaned.' },
   replyConfirm: { id: 'confirmations.reply.confirm', defaultMessage: 'Reply' },
   replyMessage: { id: 'confirmations.reply.message', defaultMessage: 'Replying now will overwrite the message you are currently composing. Are you sure you want to proceed?' },
 });
diff --git a/app/javascript/flavours/glitch/features/status/index.jsx b/app/javascript/flavours/glitch/features/status/index.jsx
index 0f2c594bd8..d35b3a522a 100644
--- a/app/javascript/flavours/glitch/features/status/index.jsx
+++ b/app/javascript/flavours/glitch/features/status/index.jsx
@@ -66,7 +66,7 @@ const messages = defineMessages({
   deleteConfirm: { id: 'confirmations.delete.confirm', defaultMessage: 'Delete' },
   deleteMessage: { id: 'confirmations.delete.message', defaultMessage: 'Are you sure you want to delete this status?' },
   redraftConfirm: { id: 'confirmations.redraft.confirm', defaultMessage: 'Delete & redraft' },
-  redraftMessage: { id: 'confirmations.redraft.message', defaultMessage: 'Are you sure you want to delete this status and re-draft it? Favourites and boosts will be lost, and replies to the original post will be orphaned.' },
+  redraftMessage: { id: 'confirmations.redraft.message', defaultMessage: 'Are you sure you want to delete this status and re-draft it? Favorites and boosts will be lost, and replies to the original post will be orphaned.' },
   revealAll: { id: 'status.show_more_all', defaultMessage: 'Show more for all' },
   hideAll: { id: 'status.show_less_all', defaultMessage: 'Show less for all' },
   statusTitleWithAttachments: { id: 'status.title.with_attachments', defaultMessage: '{user} posted {attachmentCount, plural, one {an attachment} other {# attachments}}' },
diff --git a/app/javascript/flavours/glitch/features/ui/components/navigation_panel.jsx b/app/javascript/flavours/glitch/features/ui/components/navigation_panel.jsx
index e1c2e68e91..c0726404ee 100644
--- a/app/javascript/flavours/glitch/features/ui/components/navigation_panel.jsx
+++ b/app/javascript/flavours/glitch/features/ui/components/navigation_panel.jsx
@@ -21,7 +21,7 @@ const messages = defineMessages({
   explore: { id: 'explore.title', defaultMessage: 'Explore' },
   firehose: { id: 'column.firehose', defaultMessage: 'Live feeds' },
   direct: { id: 'navigation_bar.direct', defaultMessage: 'Private mentions' },
-  favourites: { id: 'navigation_bar.favourites', defaultMessage: 'Favourites' },
+  favourites: { id: 'navigation_bar.favourites', defaultMessage: 'Favorites' },
   bookmarks: { id: 'navigation_bar.bookmarks', defaultMessage: 'Bookmarks' },
   lists: { id: 'navigation_bar.lists', defaultMessage: 'Lists' },
   preferences: { id: 'navigation_bar.preferences', defaultMessage: 'Preferences' },
diff --git a/app/javascript/flavours/glitch/features/ui/components/sign_in_banner.jsx b/app/javascript/flavours/glitch/features/ui/components/sign_in_banner.jsx
index 45e4e89f15..ea7de7efbb 100644
--- a/app/javascript/flavours/glitch/features/ui/components/sign_in_banner.jsx
+++ b/app/javascript/flavours/glitch/features/ui/components/sign_in_banner.jsx
@@ -34,7 +34,7 @@ const SignInBanner = () => {
 
   return (
     <div className='sign-in-banner'>
-      <p><FormattedMessage id='sign_in_banner.text' defaultMessage='Login to follow profiles or hashtags, favourite, share and reply to posts. You can also interact from your account on a different server.' /></p>
+      <p><FormattedMessage id='sign_in_banner.text' defaultMessage='Login to follow profiles or hashtags, favorite, share and reply to posts. You can also interact from your account on a different server.' /></p>
       {signupButton}
       <a href='/auth/sign_in' className='button button--block button-tertiary'><FormattedMessage id='sign_in_banner.sign_in' defaultMessage='Login' /></a>
     </div>