chore: Migrate to local_time for NPM support

[arkirchner]

jQuery.timeago has no NPM package. local_time is used as a replacement to support the migration to Webpack.

Related to #3021

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.25%. Comparing base (bc52f12) to head (f1e8bfe).

Additional details and impacted files

@@                         Coverage Diff                          @@
##           ak/finish_removal_from_live_updates    #3058   +/-   ##
====================================================================
  Coverage                                70.25%   70.25%           
====================================================================
  Files                                      213      213           
  Lines                                     6814     6814           
====================================================================
  Hits                                      4787     4787           
  Misses                                    2027     2027           

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[MrSerth]

An early comment for your work-in-progress. Please ignore it if you're still working on that ;)