Fix various WCAG things in frontend

All A and AA problems have been fixed except a missing label on an input field.

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• cf766b06 - Add missing translation

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• cf766b06...e6fb1d2f - 9 commits from branch master
• 494cab28 - Fix various WCAG things in frontend
• 8d18947d - Add missing translation

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added 1 commit

• 08611b4e - Fix small frontend things

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merged

mentioned in commit 44f7d800