mobile captions reach out of postcard (screenshots) with long lk name

[aeschi]

tested on chroma and safari on iPhone XS (375px × 812px viewport) on taz deploy

• [ ] gebäude neubauten
• [ ] landwirtschaft density
• [ ] car density

(some might already be fixed by Johanna)

[more-ginger]

I can't reproduce, not sure if solved or simply different viewport sizes when testing. @johannahaha ?