fix: add weekend schedule

[limwa]

Closes #946.

Supersedes #1039.

In this PR, a tab for Saturday is added. Furthermore, a new translation for no classes on weekends is also added.

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 #1172 (a5ad009) into develop (2d0c6c2) will increase coverage by 1%.
Report is 2 commits behind head on develop.
The diff coverage is 92%.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #1172   +/-   ##
=======================================
+ Coverage       15%     15%   +1%     
=======================================
  Files          228     228           
  Lines         6899    6907    +8     
=======================================
+ Hits          1020    1027    +7     
- Misses        5879    5880    +1     

[LuisDuarte1]

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