🔧 Improve translation scripts

[strarsis]

This PR adds more and improves existing translation related npm scripts:

npm scripts

• translate: Run translate:pot and translate:update.
  This is used to update the PO files to the latest translatable strings in the theme.

  • translate:pot: Update the Poedit Template (POT) file from the theme files.
  • translate:update: Update PO translation files (for a specific locale, e.g. de_DE) from the Poedit Template (POT) file.

• translate:compile: Run translate:js and translate:mo.
  This is used to compile all the PO files to JSON and MO for usage in PHP/JavaScript/WordPress.

  • translate:js: Generate the JavaScript JSON translation files from PO files, used by JavaScript related WordPress components like Gutenberg Blocks in the Gutenberg Editor.
  • translate:mo: Compile PO translation files to compiled, efficient MO files that are used by PHP/WordPress.

Workflow:

• npm run translate to scan and update the PO translation files from the theme.
• Open and update the PO translation files with a suitable program (usually PoEdit).
• npm run translate:compile to compile the PO translation files to MO files that can be used by PHP/WordPress and to JavaScript JSON files that can be used by WordPress JavaScript (Gutenberg).
• (Commit these translation-related changes).

WP CLI i18n supporting versions

WP CLI i18n has support for parsing out translation strings from Blade-PHP templates now.
A new version of wp-cli/i18n-command that contains the merged PR should be released in the near future.
In the meantime, installing wp-cli/i18n-command from the repository can be used to get PHP-Blade support:
When you have a i18n release newer than 2.2.13 and WP CLI release newer than 2.6.0 installed,
PHP-Blade support should be already included.
You can use wp i18n make-pot --help | grep blade and check whether blade is mentioned.

[retlehs]

@strarsis i just wanted to say

1. thank you for this PR
2. thank you for the upstream work @ wp-cli/i18n-command

i'll circle back soon to review soon

[retlehs]

1. lets get npm run replaced with yarn
2. https://docs.roots.io/sage/10.x/localization/ needs updating