make rtl checks error level and apply fixes

[hamza221]

ref nextcloud/mail#11445

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 10.56%. Comparing base (c12b745) to head (8590f5a).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #4602   +/-   ##
=========================================
  Coverage     10.56%   10.56%           
  Complexity      265      265           
=========================================
  Files           123      123           
  Lines          5767     5767           
  Branches       1262     1262           
=========================================
  Hits            609      609           
  Misses         5035     5035           
  Partials        123      123           

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