Switch out the bootstrap utility classes with gl-utility classes
(to the extent possible).

Update rspec for issues api endpoint

Update issuable spec

Add localized string

Remove trailing whitespace

Re-adjusted utility classes

Add important directive to gl-ml-2

Remove unused class after resolving conflict

Add link to blocking issues count

Consolidate issuable meta icons

Put all of issuable meta icons into one array
Then iterate through them.