Strip @mention for article language resolver

[robertu7]

#4155

[codecov]

Codecov Report

Attention: Patch coverage is 28.57143% with 5 lines in your changes missing coverage. Please review.

Project coverage is 60.89%. Comparing base (c87d453) to head (4e06540).
Report is 5 commits behind head on develop.

Files	Patch %	Lines
src/common/utils/mention.ts	25.00%	3 Missing ⚠️
src/queries/article/language.ts	33.33%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4156      +/-   ##
===========================================
- Coverage    60.90%   60.89%   -0.01%     
===========================================
  Files          952      952              
  Lines        18742    18748       +6     
  Branches      3407     3407              
===========================================
+ Hits         11414    11416       +2     
- Misses        7275     7279       +4     
  Partials        53       53              

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