feat(lang): added arabic seek button translations

[silevitas]

Description

Added two Arabic new seek button translations.

Specific Changes proposed

Arabic translations for Skip backward {1} seconds and Skip forward {1} seconds.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.71%. Comparing base (a57b07a) to head (4ce9836).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8616   +/-   ##
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  Coverage   82.71%   82.71%           
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  Files         113      113           
  Lines        7636     7636           
  Branches     1835     1835           
=======================================
  Hits         6316     6316           
  Misses       1320     1320           

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[mister-ben]

This line and the corresponding one in the forward buttons should use this.skipTime.toLocaleString(player.language()) so actual Arabic numbers rather than what we call Arabic numbers are used.

video.js/src/js/control-bar/skip-buttons/skip-backward.js

Line 21 in a57b07a

this.controlText(this.localize('Skip backward {1} seconds', [this.skipTime]));

[silevitas]

Added the localisation support to the skipButtons as recommended!

[welcome]

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