templates: use shared breadcrumb renderer

[nijel]

Proposed changes

This will make projectlanguge and category work consistently at all levels.

Issue #263

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

Merging #9746 (2f7a91d) into main (5899ef1) will increase coverage by 0.08%.
Report is 10 commits behind head on main.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9746      +/-   ##
==========================================
+ Coverage   90.75%   90.84%   +0.08%     
==========================================
  Files         758      768      +10     
  Lines       56065    56201     +136     
  Branches     8719     8745      +26     
==========================================
+ Hits        50883    51057     +174     
+ Misses       3635     3602      -33     
+ Partials     1547     1542       -5     

Files Changed	Coverage Δ
weblate/trans/views/basic.py	85.00% <ø> (ø)
weblate/trans/views/edit.py	81.33% <ø> (ø)
weblate/utils/views.py	82.86% <100.00%> (ø)

... and 32 files with indirect coverage changes