OPNsense language translation kit

The kit requires additional tools in order to properly extract strings from the source code. You'll need to run this once locally:

# pkg install gettext-tools p5-Locale-Maketext-Lexicon python27

Regenerate dynamic strings that can't be found in the template generation step (XML contents, etc.):

# make dynamic

Regenerate the translation template using:

# make template

Merge the latest template changes into the actual translations:

# make merge

The build system will automatically pick up all registered languages.