Shortened keys that are used in the i18n JS files

Looks like there may be some strings in there that are no longer used so should do a review later to determine what can be removed (some seem to duplicate the %templ-* strings which are only used for templates and not JS).

Also did not shorten Charts and Geomap strings yet since they haven't been ported/merged in yet.

Should also consider splitting JS strings from template/theme strings.