Cleanup translation files and rename trans_script to compile-translations

[osma]

There are 3 cleanup style changes to the translation files under resource/translations:

1. Remove unnecessary .mo files (the real ones are under language specific directories)
2. Remove an unnecessary execute bit on one of the .po files
3. Rename the strangely named script trans_script to compile-translations to better reflect what it does

I don't expect 1. and 2. to be controversial at all, but 3 could be. Also need to update the wiki documentation on translations accordingly.

[codecov]

Codecov Report

Merging #1199 (c858069) into master (7a570ff) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1199   +/-   ##
=========================================
  Coverage     68.71%   68.71%           
  Complexity     1598     1598           
=========================================
  Files            32       32           
  Lines          3929     3929           
=========================================
  Hits           2700     2700           
  Misses         1229     1229           

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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[osma]

Merged the changes to master and updated the Translations wiki page accordingly.