Fixes #6156 Fixes #6180 RTL template

[t-book]

This adds the RTL Feature as described at #6182.

• A new less file has been added to keep things tidy.
• The map viewer(s) and metadata Wizard has been kept LTR as there js does set animation directions

I'm adding some impressions here: https://www.dropbox.com/sh/m6w7b58a99tl993/AABPAGYFc5l8ILEHMaO_eZHda?dl=0

The arabic translation needs further work. Hopefully to come.

Checklist

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[codecov]

Codecov Report

Merging #6183 into master will not change coverage.
The diff coverage is n/a.

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  Coverage   59.45%   59.45%           
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  Files         181      181           
  Lines       20176    20176           
  Branches     3341     3341           
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  Hits        11995    11995           
  Misses       7124     7124           
  Partials     1057     1057