Fixes + some UI/UX

[odeimaiz]

What do these changes do?

• Study sheet: Title in one line and cropped if too long (tootlip is added in this case)
• Fixed always present iFrame
• Fixed export setEnabled
• Sync back and frontend: Only TESTERs can crud templates

Related issue number

[codecov]

Codecov Report

Merging #1471 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1471   +/-   ##
=======================================
  Coverage   71.69%   71.69%           
=======================================
  Files         245      245           
  Lines        9804     9804           
  Branches     1076     1076           
=======================================
  Hits         7029     7029           
  Misses       2469     2469           
  Partials      306      306           

Flag	Coverage Δ
#integrationtests	58.36% <ø> (ø)
#unittests	63.62% <ø> (ø)

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[ignapas]

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