[TASK] Optimize UI of language packs management

The UI of the "Manage Language Packs" modal is optimized:

- Buttons are grouped into a `btn-group`
- Language name is rendered next to the buttons
- Space is added between extension icon and title

Resolves: #88885
Releases: master
Change-Id: I728ef22a5983ae7d419f88b7ceffd552ef2a1b33
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/61398


Tested-by: Josef Glatz <josefglatz@gmail.com>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Josef Glatz <josefglatz@gmail.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>