Minor formatting changes, added DB call for custom fields

Bumped version for RC-3 release

Fix to Dockerfile build; backup path must've changed.

Forgot to add the new docker.env file

Updated language strings

Fixed version number

Search by asset tag

Compatible with barcode scanners

Added additional dump variables

Updated changelog

Merge pull request grokability#1554 from snipe/final_custom_fields_tw…

…eaks

Final custom fields tweaks