Fix validation of not required fields.
Fix validation of not required fields.

Replace early return with second `if`.
Merge pull request #1477 from vogdb/issue-1477

Fix validation bug of CM_Form_Abstract. Unrequired field is being validated.
- use a left join to also delete duplicate language keys without value
- don't use binary comparison for  group by statement so names with trailing spaces count as duplicate of regular names
Merge pull request #1478 from alexispeter/languagekey-followup

Followup to #1465
Change runtime clear interval from 5 mins to 5 secs
Merge pull request #1479 from njam/runtime-cache-clear

Change runtime clear interval from 5 mins to 5 secs
change button font weight to normal
Merge pull request #1480 from njam/button-font-weight

change button font weight to normal