feat(accounts): make identities listing responsive

[nijel]

Proposed changes

Fixes #11860

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 90.57%. Comparing base (6aee586) to head (7dee0ba).
Report is 3971 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11874      +/-   ##
==========================================
- Coverage   90.82%   90.57%   -0.25%     
==========================================
  Files         554      576      +22     
  Lines       57306    58706    +1400     
  Branches     9122     9385     +263     
==========================================
+ Hits        52046    53174    +1128     
- Misses       3640     3833     +193     
- Partials     1620     1699      +79     

Files with missing lines	Coverage Δ
weblate/accounts/templatetags/authnames.py	85.71% <100.00%> (+0.42%)	⬆️

... and 322 files with indirect coverage changes