Allow pausing of near-breach issues.
Restore ability to create new issue priorities
Allow existing priorities to have sla seconds reset to blank
Fix some validation problems
Prevent and warn about near-breach seconds being larger than sla seconds (or present when sla seconds is not).
Add missing locale strings.
Merge pull request #90 from blrnw3/issue_priority-fixes

Issue priority fixes, and some more near_breach fixes.