Reinvestigate how we compile translation files

[benlk]

grunt pot po2mo shell:msgmerge should generate translation files, compile them into mo files, and merge those with msgmerge:

Merges two Uniforum style .po files together. The def.po file is an
existing PO file with translations which will be taken over to the newly
created file as long as they still match; comments will be preserved,
but extracted comments and file positions will be discarded. The ref.pot
file is the last created PO file with up-to-date source references but
old translations, or a PO Template file (generally created by xgettext);
any translations or comments in the file will be discarded, however dot
comments and file positions will be preserved. Where an exact match
cannot be found, fuzzy matching is used to produce better results.

But nowish, we're running into MicheleBertoli/grunt-po2mo#8

So ... yeah.

grunt pot can be rewritten to use https://developer.wordpress.org/cli/commands/i18n/, but what about po2mo?

[benlk]

https://developer.wordpress.org/themes/functionality/localization/