(Update) Subtitles System

[PyR8zdl]

1. Fixed typo in return route. Reverted.
2. Made the use of filesystem consistent.
3. Removed unneeded copy to tmp directory.
4. Simplified mime-type and file return.

[codecov]

Codecov Report

Merging #1341 into master will decrease coverage by 0.15%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #1341      +/-   ##
============================================
- Coverage     26.05%   25.89%   -0.16%     
+ Complexity     4225     4223       -2     
============================================
  Files           299      299              
  Lines         13276    13271       -5     
============================================
- Hits           3459     3437      -22     
- Misses         9817     9834      +17     

Impacted Files	Coverage Δ	Complexity Δ
app/Http/Controllers/SubtitleController.php	0.00% <0.00%> (ø)	23.00 <0.00> (-2.00)
app/Jobs/ProcessMassPM.php	0.00% <0.00%> (-100.00%)	2.00% <0.00%> (ø%)
...pp/Http/Controllers/Staff/MassActionController.php	60.00% <0.00%> (-6.67%)	6.00% <0.00%> (ø%)
app/Models/User.php	37.69% <0.00%> (-3.97%)	122.00% <0.00%> (ø%)
app/Repositories/ChatRepository.php	67.66% <0.00%> (-3.60%)	47.00% <0.00%> (ø%)
app/Http/Controllers/CommentController.php	77.03% <0.00%> (-1.49%)	46.00% <0.00%> (ø%)
app/Http/Controllers/AnnounceController.php	45.27% <0.00%> (ø)	66.00% <0.00%> (ø%)
app/Http/Controllers/FollowController.php	77.77% <0.00%> (+3.70%)	7.00% <0.00%> (ø%)
app/Notifications/NewUnfollow.php	100.00% <0.00%> (+100.00%)	3.00% <0.00%> (ø%)

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