UX: Always show the select panel

[d-buchmann]

Make the select panel always visible because several user reports suggest that they are unaware of the feature.
Also solves the minor issue that selecting/deselecting a single row changes the position of the table which makes it prone to misclicks.

Note: Translations have been adjusted in place, changes should be reflected in crowdin in case this will be merged.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.22%. Comparing base (c52126c) to head (a43b64b).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #997      +/-   ##
============================================
- Coverage     56.24%   56.22%   -0.02%     
  Complexity     6679     6679              
============================================
  Files           549      549              
  Lines         21736    21736              
============================================
- Hits          12225    12222       -3     
- Misses         9511     9514       +3     

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[jbtronics]

Im not a huge fan of this, as without selection this bar is just useless.
I have now implemented an alternative, which i hope should have the same advantages. The action bar is now sticky floating over the table. So you should notice it quite easily when clicking a checkbox.

This also helps, that you do not have to scroll back to the top, after doing the selection.

[d-buchmann]

This looks very nice.
I'm fine with closing this PR, but I'd appreciate if you consider cherry-picking the translation update 7993228 ;)

[jbtronics]

done