Redo sorting arrows

Xaverrequested to merge
x-f/ispconfig3:task/arrows into develop

  1. Add an icon (UTF-8) for sortable cols
    image

  2. Change Background Gradient (reverse) for active state
    image

  3. Use arrows to show sorting
    image
    image

  4. Remove Bold (changes width, sometimes the available space is not a lot) - See Screenshots above

Edited by Xaver

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