Fix some small accessibility issues

[LEDfan]

• Target version: master

Summary

Fixed some small accessibility issues fund during the workshop at the Nextcloud conf 👍 using the aXe browser extension.

TODO

There are still some harder issues left:

(The first one is a false-positive due to ng-if).

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Documentation (manuals or wiki) has been updated or is not required

[codecov]

Codecov Report

Merging #597 into master will not change coverage.
The diff coverage is n/a.

@@ Coverage Diff @@## master #597 +/- ##
=======================================
Coverage 75.46% 75.46% =======================================
Files 52 52 Lines 1969 1969 =======================================
Hits 1486 1486 Misses 483 483

[juliusknorr]

Awesome. 🎉 Thank you very much for looking into that @LEDfan

[juliusknorr]

Can you open an issue for the remaining tasks?

[LEDfan]

Yup, here it is #598