Unused months removal

[DGoiana]

Closes #996
Removes months variable, which was not used.

Review checklist

• Terms and conditions reflect the current change
• Contains enough appropriate tests
• If aimed at production, writes a new summary in whatsnew/whatsnew-pt-PT
• Properly adds an entry in changelog.md with the change
• If PR includes UI updates/additions, its description has screenshots
• Behavior is as expected
• Clean, well-structured code

[codecov]

Codecov Report

Merging #1002 (47736bb) into develop (012aa85) will decrease coverage by 6%.
Report is 41 commits behind head on develop.
The diff coverage is 12%.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #1002     +/-   ##
=========================================
- Coverage       23%     16%     -6%     
=========================================
  Files          143     201     +58     
  Lines         4349    6361   +2012     
=========================================
+ Hits           964     986     +22     
- Misses        3385    5375   +1990