Add supports plural condition for the plural form

[harriebird]

Proposed changes

The plural form currently is displayed if plural.number > 1 and forgot to check if the format supports plurals. This will add another condition to see if the format set in the component supports plurals.
This solves issue #12044.

Checklist

• Lint and unit tests pass locally with my changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have added documentation to describe my feature.
• I have squashed my commits into logic units.
• I have described the changes in the commit messages.

Other information

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.58%. Comparing base (6aee586) to head (30e4e58).
Report is 2566 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12053      +/-   ##
==========================================
- Coverage   90.82%   90.58%   -0.24%     
==========================================
  Files         554      582      +28     
  Lines       57306    59284    +1978     
  Branches     9122     9470     +348     
==========================================
+ Hits        52046    53705    +1659     
- Misses       3640     3871     +231     
- Partials     1620     1708      +88     

Files	Coverage Δ
weblate/trans/views/basic.py	81.56% <ø> (-1.36%)	⬇️

... and 358 files with indirect coverage changes