Shrink down Buttons with Labels to Icons when in mobile mode

[Felitendo]

Feature Description

When making the Browser Window smaller or when I'm accessing Gitea on mobile then the "Watch" and "Favourite" Buttons still display the Label Text. I think this should be handled like GitHub where it get's shrinked down to just the Icon.

Screenshots

Gitea Fullscreen:

Gitea small/mobile Layout:

GitHub Fullscreen:

GitHub small/mobile Layout:

[wxiaoguang]

Will be fixed by Fix various frontend trivial problems #34263