Instead of using fix() or chore() when labelling a commit which improves
speed or performance use perf(). Perf commits will be listed in the
CHANGELOG under "Performance Improvements".
For example:
perf($animate): cache all getComputedStyle operations to reduce additional reflows
Angular uses the I18N code from Closure library to generate its own localization
files. So there is no point submitting pull requests for these files, since
all changes would be lost when we next generate these files.
Closes#4610
