[frontend] replaced . with [dot] in filename when exporting dashboard…

[stefan1anuby]

The fix that I came up with is to replace "." with "[dot]"

Related issues

• part of [Dashboard] Exporting a dashboard with a “.” in the name doesn't add the “.json”. #8268

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.21%. Comparing base (b29748b) to head (a859d63).
Report is 94 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8287      +/-   ##
==========================================
- Coverage   66.23%   66.21%   -0.02%     
==========================================
  Files         597      597              
  Lines       60300    60422     +122     
  Branches     6196     6204       +8     
==========================================
+ Hits        39939    40008      +69     
- Misses      20361    20414      +53     

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