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
96 jobs for js-18n-batch-comments in 86 minutes and 9 seconds (queued for 14 seconds)
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