Fix "pulls.blocked_by_approvals" text

[adelowo]

Changed

This Pull Request hasn't enough approvals yet. %d of %d approvals granted.

to

This Pull Request doesn't have enough approvals yet. %d of %d approvals granted

[codecov-io]

Codecov Report

Merging #5879 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5879      +/-   ##
==========================================
- Coverage   37.84%   37.83%   -0.02%     
==========================================
  Files         328      328              
  Lines       48326    48326              
==========================================
- Hits        18290    18283       -7     
- Misses      27404    27410       +6     
- Partials     2632     2633       +1

Impacted Files	Coverage Δ
modules/process/manager.go	76.81% <0%> (-4.35%)	⬇️
routers/repo/view.go	46.1% <0%> (-1.2%)	⬇️

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