diff --git a/app/assets/javascripts/behaviors/copy_to_clipboard.js b/app/assets/javascripts/behaviors/copy_to_clipboard.js
index 9a33a060c7697020f8424887a4ed836c8e5ba46a..c3541e625681f914eb1eec1dd06015c2e45a1640 100644
--- a/app/assets/javascripts/behaviors/copy_to_clipboard.js
+++ b/app/assets/javascripts/behaviors/copy_to_clipboard.js
@@ -1,5 +1,6 @@
 import $ from 'jquery';
 import Clipboard from 'clipboard';
+import { sprintf, __ } from '~/locale';
 
 function showTooltip(target, title) {
   const $target = $(target);
@@ -16,7 +17,7 @@ function showTooltip(target, title) {
 }
 
 function genericSuccess(e) {
-  showTooltip(e.trigger, 'Copied');
+  showTooltip(e.trigger, __('Copied'));
   // Clear the selection and blur the trigger so it loses its border
   e.clearSelection();
   $(e.trigger).blur();
@@ -33,7 +34,7 @@ function genericError(e) {
   } else {
     key = 'Ctrl';
   }
-  showTooltip(e.trigger, `Press ${key}-C to copy`);
+  showTooltip(e.trigger, sprintf(__(`Press %{key}-C to copy`), { key }));
 }
 
 export default function initCopyToClipboard() {
diff --git a/app/assets/javascripts/behaviors/markdown/nodes/table_of_contents.js b/app/assets/javascripts/behaviors/markdown/nodes/table_of_contents.js
index 20c7fa8a9ab479ebf19bbad6f2493f329395b0e0..9a2e2c032134972b06fa3c64113d99ac0804e7b4 100644
--- a/app/assets/javascripts/behaviors/markdown/nodes/table_of_contents.js
+++ b/app/assets/javascripts/behaviors/markdown/nodes/table_of_contents.js
@@ -1,6 +1,7 @@
 /* eslint-disable class-methods-use-this */
 
 import { Node } from 'tiptap';
+import { __ } from '~/locale';
 
 // Transforms generated HTML back to GFM for Banzai::Filter::TableOfContentsFilter
 export default class TableOfContents extends Node {
@@ -22,7 +23,7 @@ export default class TableOfContents extends Node {
           priority: 51,
         },
       ],
-      toDOM: () => ['p', { class: 'table-of-contents' }, 'Table of Contents'],
+      toDOM: () => ['p', { class: 'table-of-contents' }, __('Table of Contents')],
     };
   }
 
diff --git a/app/assets/javascripts/behaviors/preview_markdown.js b/app/assets/javascripts/behaviors/preview_markdown.js
index 7adccbb062f7b66b89cd8418d8a72d504e225062..35874140bf9a8d03ba79af21db86acc62ea61144 100644
--- a/app/assets/javascripts/behaviors/preview_markdown.js
+++ b/app/assets/javascripts/behaviors/preview_markdown.js
@@ -22,7 +22,7 @@ function MarkdownPreview() {}
 
 // Minimum number of users referenced before triggering a warning
 MarkdownPreview.prototype.referenceThreshold = 10;
-MarkdownPreview.prototype.emptyMessage = 'Nothing to preview.';
+MarkdownPreview.prototype.emptyMessage = __('Nothing to preview.');
 
 MarkdownPreview.prototype.ajaxCache = {};
 
@@ -40,7 +40,7 @@ MarkdownPreview.prototype.showPreview = function($form) {
     preview.text(this.emptyMessage);
     this.hideReferencedUsers($form);
   } else {
-    preview.addClass('md-preview-loading').text('Loading...');
+    preview.addClass('md-preview-loading').text(__('Loading...'));
     this.fetchMarkdownPreview(
       mdText,
       url,
diff --git a/app/assets/javascripts/behaviors/quick_submit.js b/app/assets/javascripts/behaviors/quick_submit.js
index c1ea67f929382344a77f3b19ee391b904d5733d0..530ab0bd4d99fa6a77d211470587119918571483 100644
--- a/app/assets/javascripts/behaviors/quick_submit.js
+++ b/app/assets/javascripts/behaviors/quick_submit.js
@@ -1,6 +1,7 @@
 import $ from 'jquery';
 import '../commons/bootstrap';
 import { isInIssuePage } from '../lib/utils/common_utils';
+import { __ } from '~/locale';
 
 // Quick Submit behavior
 //
@@ -65,7 +66,9 @@ $(document).on(
     }
 
     const $this = $(this);
-    const title = isMac() ? 'You can also press ⌘-Enter' : 'You can also press Ctrl-Enter';
+    const title = isMac()
+      ? __('You can also press ⌘-Enter')
+      : __('You can also press Ctrl-Enter');
 
     $this.tooltip({
       container: 'body',
diff --git a/locale/gitlab.pot b/locale/gitlab.pot
index 7e2c2a160ef730a10e730a9a1a78d5a48bd54ea2..57bb25b690099987b93352745dcef08e8edd92b4 100644
--- a/locale/gitlab.pot
+++ b/locale/gitlab.pot
@@ -2690,6 +2690,9 @@ msgstr ""
 msgid "ConvDev Index"
 msgstr ""
 
+msgid "Copied"
+msgstr ""
+
 msgid "Copy %{http_label} clone URL"
 msgstr ""
 
@@ -6173,6 +6176,9 @@ msgstr ""
 msgid "Notes|Show history only"
 msgstr ""
 
+msgid "Nothing to preview."
+msgstr ""
+
 msgid "Notification events"
 msgstr ""
 
@@ -6751,6 +6757,9 @@ msgstr ""
 msgid "Preferences|This feature is experimental and translations are not complete yet"
 msgstr ""
 
+msgid "Press %{key}-C to copy"
+msgstr ""
+
 msgid "Press Enter or click to search"
 msgstr ""
 
@@ -8869,6 +8878,9 @@ msgstr ""
 msgid "System metrics (Kubernetes)"
 msgstr ""
 
+msgid "Table of Contents"
+msgstr ""
+
 msgid "Tag"
 msgstr ""
 
@@ -10659,6 +10671,12 @@ msgstr ""
 msgid "You can also create a project from the command line."
 msgstr ""
 
+msgid "You can also press ⌘-Enter"
+msgstr ""
+
+msgid "You can also press Ctrl-Enter"
+msgstr ""
+
 msgid "You can also star a label to make it a priority label."
 msgstr ""