I18N of merge conflicts directory

This is one of many MRs opened in order to improve the overall
internationalisation of the GitLab codebase.

This commit only targets Vanilla JS files.

i18n documentation
https://docs.gitlab.com/ee/development/i18n/externalization.html

app/assets/javascripts/merge_conflicts/merge_conflict_store.js

@@ -3,15 +3,16 @@
 import $ from 'jquery';
 import Vue from 'vue';
 import Cookies from 'js-cookie';
+import { s__ } from '~/locale';
 
 (global => {
   global.mergeConflicts = global.mergeConflicts || {};
 
   const diffViewType = Cookies.get('diff_view');
-  const HEAD_HEADER_TEXT = 'HEAD//our changes';
-  const ORIGIN_HEADER_TEXT = 'origin//their changes';
-  const HEAD_BUTTON_TITLE = 'Use ours';
-  const ORIGIN_BUTTON_TITLE = 'Use theirs';
+  const HEAD_HEADER_TEXT = s__('MergeConflict|HEAD//our changes');
+  const ORIGIN_HEADER_TEXT = s__('MergeConflict|origin//their changes');
+  const HEAD_BUTTON_TITLE = s__('MergeConflict|Use ours');
+  const ORIGIN_BUTTON_TITLE = s__('MergeConflict|Use theirs');
   const INTERACTIVE_RESOLVE_MODE = 'interactive';
   const EDIT_RESOLVE_MODE = 'edit';
   const DEFAULT_RESOLVE_MODE = INTERACTIVE_RESOLVE_MODE;
@@ -173,7 +174,7 @@ import Cookies from 'js-cookie';
 
     getConflictsCountText() {
       const count = this.getConflictsCount();
-      const text = count > 1 ? 'conflicts' : 'conflict';
+      const text = count > 1 ? s__('MergeConflict|conflicts') : s__('MergeConflict|conflict');
 
       return `${count} ${text}`;
     },
@@ -348,8 +349,8 @@ import Cookies from 'js-cookie';
     },
 
     getCommitButtonText() {
-      const initial = 'Commit to source branch';
-      const inProgress = 'Committing...';
+      const initial = s__('MergeConflict|Commit to source branch');
+      const inProgress = s__('MergeConflict|Committing...');
 
       return this.state ? (this.state.isSubmitting ? inProgress : initial) : initial;
     },

app/assets/javascripts/merge_conflicts/merge_conflicts_bundle.js

@@ -8,6 +8,7 @@ import './components/diff_file_editor';
 import './components/inline_conflict_lines';
 import './components/parallel_conflict_lines';
 import syntaxHighlight from '../syntax_highlight';
+import { __ } from '~/locale';
 
 export default function initMergeConflicts() {
   const INTERACTIVE_RESOLVE_MODE = 'interactive';
@@ -92,7 +93,7 @@ export default function initMergeConflicts() {
           })
           .catch(() => {
             mergeConflictsStore.setSubmitState(false);
-            createFlash('Failed to save merge conflicts resolutions. Please try again!');
+            createFlash(__('Failed to save merge conflicts resolutions. Please try again!'));
           });
       },
     },

locale/gitlab.pot

@@ -4947,6 +4947,9 @@ msgstr ""
 msgid "Failed to reset key. Please try again."
 msgstr ""
 
+msgid "Failed to save merge conflicts resolutions. Please try again!"
+msgstr ""
+
 msgid "Failed to save new settings"
 msgstr ""
 
@@ -7498,6 +7501,30 @@ msgstr ""
 msgid "Merge when pipeline succeeds"
 msgstr ""
 
+msgid "MergeConflict|Commit to source branch"
+msgstr ""
+
+msgid "MergeConflict|Committing..."
+msgstr ""
+
+msgid "MergeConflict|HEAD//our changes"
+msgstr ""
+
+msgid "MergeConflict|Use ours"
+msgstr ""
+
+msgid "MergeConflict|Use theirs"
+msgstr ""
+
+msgid "MergeConflict|conflict"
+msgstr ""
+
+msgid "MergeConflict|conflicts"
+msgstr ""
+
+msgid "MergeConflict|origin//their changes"
+msgstr ""
+
 msgid "MergeRequests|Add a reply"
 msgstr ""