Title Case used for Milestones and Weights

The following discussion from !2912 (merged) should be addressed:

• @MadLittleMods commented on a discussion: (+3 comments)

We use title case for 'Any Milestone', 'No Milestone', 'No Weight' and 'Any Weight'

This should use sentence case: 'Any milestone', 'No milestone'

Places this needs changing:

models/issue.rb
milestone_select.js