Tweak language stats bar

[silverwind]

• Ensure bar does not overflow parent (fixing border-radii)
• Remove unneccessary borders/background
• Fix shaky page caused by JS animation miscalculation by setting fixed height on the summary box. Box itself is still shaky during animation, but better it then the whole page.

Fixes: #10474

Before:

After:

[codecov-io]

Codecov Report

Merging #10487 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #10487      +/-   ##
==========================================
+ Coverage   43.66%   43.68%   +0.02%     
==========================================
  Files         586      586              
  Lines       81408    81408              
==========================================
+ Hits        35547    35565      +18     
+ Misses      41460    41433      -27     
- Partials     4401     4410       +9

Impacted Files	Coverage Δ
modules/git/command.go	86.95% <0%> (-2.61%)	⬇️
services/pull/temp_repo.go	29.05% <0%> (-2.57%)	⬇️
services/pull/patch.go	60.37% <0%> (-2.52%)	⬇️
models/pull.go	42.37% <0%> (+0.55%)	⬆️
modules/queue/workerpool.go	58% <0%> (+1.06%)	⬆️
modules/queue/unique_queue_disk_channel.go	55.76% <0%> (+1.92%)	⬆️
services/pull/check.go	50% <0%> (+11.58%)	⬆️

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