**Backport:** https://codeberg.org/forgejo/forgejo/pulls/6700
Fix regression of https://codeberg.org/forgejo/forgejo/pulls/6344. It was reported by @Beowulf.
JS toggle [used](49c5102b40/templates/repo/sub_menu.tmpl (L38)) a selector which was broken by that PR, which caused the legend to appear separately instead of replacing the primary repo info.
## Changes
* use clear IDs `language-stats-bar` and `language-stats-legend`
* add simple e2e test
Instead of restoring the previous behavior, I moved the legend under the stats bar. To me it didn't make a lot of sense in the first place to replace the information in the primary bar with with completely different information. It did not save much space either.
Co-authored-by: 0ko <0ko@noreply.codeberg.org>
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/6854
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: forgejo-backport-action <forgejo-backport-action@noreply.codeberg.org>
Co-committed-by: forgejo-backport-action <forgejo-backport-action@noreply.codeberg.org>
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