I18N of batch_comments 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/batch_comments/mixins/resolved_status.js

+import { sprintf, __ } from '~/locale';
+
 export default {
   computed: {
     resolveButtonTitle() {
-      let title = 'Mark comment as resolved';
+      let title = __('Mark comment as resolved');
 
       if (this.resolvedBy) {
-        title = `Resolved by ${this.resolvedBy.name}`;
+        title = sprintf(__('Resolved by %{name}'), { name: this.resolvedBy.name });
       }
 
       return title;

locale/gitlab.pot

@@ -5773,6 +5773,9 @@ msgstr ""
 msgid "Mark as resolved"
 msgstr ""
 
+msgid "Mark comment as resolved"
+msgstr ""
+
 msgid "Mark this issue as a duplicate of another issue"
 msgstr ""
 
@@ -8167,6 +8170,9 @@ msgstr ""
 msgid "Resolved all discussions."
 msgstr ""
 
+msgid "Resolved by %{name}"
+msgstr ""
+
 msgid "Resolved by %{resolvedByName}"
 msgstr ""