fix: Add dir attribute to html tag in djangocms_frontend.html

[sakhawy]

Description

Added dir attribute to the html tag for #7871 to take effect.

Related resources

• #7871 to take effect.
• #7863

Checklist

• I have opened this pull request against master
• I have added or modified the tests when changing logic
• I have followed the conventional commits guidelines to add meaningful information into the changelog
• I have read the contribution guidelines and I have joined #workgroup-pr-review on Slack to find a “pr review buddy” who is going to review my pull request.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.91%. Comparing base (f11feee) to head (1605b63).
Report is 14 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #204      +/-   ##
==========================================
- Coverage   86.93%   86.91%   -0.02%     
==========================================
  Files         120      120              
  Lines        3107     3119      +12     
  Branches      330      331       +1     
==========================================
+ Hits         2701     2711      +10     
+ Misses        304      303       -1     
- Partials      102      105       +3     

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