Remove unnecessary and problematic breaks from i18n
Check for undefined to prevent errors in case of CDN problems
Fix clipped German localization in Save button with Chrome
Change name for Web container to "arsnova-mobile"
Fix for #10399: formulas are displayed as intended

MathJax delimiters are replaced in two passes instead of one.
Fix for #10399, #10426: all caps formatting for question category
Fixed #10399: no formatting in list items
Fixed #10400: hide unnecessary buttons, remove obsolete code
Fixed answers not showing up in counters
Fixed toggle buttons