Update translation handling to include core translations (https://github.com/woocommerce/woocommerce-blocks/pull/1242)

* Remove language files and po2json generation scripts

* Add action filter and function to load core translations

* Use pre_load_script_translations

* Remove script actions

* docblock

plugins/woocommerce-blocks/bin/generate-translation-json.js

@@ -1,81 +0,0 @@
-#!/usr/bin/env node
-/* eslint-disable no-console, no-useless-return */
-// Node internals
-const fs = require( 'fs' );
-const path = require( 'path' );
-
-// Packages
-const po2json = require( 'po2json' );
-const md5 = require( 'js-md5' );
-const argv = require( 'yargs' )
-	.usage( 'Usage: $0 [options]' )
-	.describe( 'source', 'Path to the language directory.' )
-	.describe(
-		'debug',
-		'Output which files are added to the zip during build.'
-	)
-	.alias( 'debug', 'v' )
-	.default( 'source', './languages' )
-	.boolean( 'v' ).argv;
-
-const sourceDir = path.resolve( argv.source );
-const showDebug = argv.debug;
-
-// Check that we have a languages directory
-if ( ! fs.existsSync( sourceDir ) ) {
-	return;
-}
-
-// Get .po files
-const files = fs
-	.readdirSync( sourceDir )
-	.filter( ( f ) => !! f.match( /\.po$/ ) );
-
-if ( ! files.length ) {
-	console.log( 'No language (.po) files found.' );
-	return;
-}
-console.log( `Found ${ files.length } language files to convert.` );
-
-// Get the built .js files
-const jsFiles = fs
-	.readdirSync( './build' )
-	.filter( ( f ) => !! f.match( /\.js$/ ) );
-console.log( `Found ${ jsFiles.length } scripts that need translations.` );
-
-files.forEach( ( file ) => {
-	if ( showDebug ) {
-		console.log( `Converting ${ file }` );
-	}
-	const filePath = path.resolve( sourceDir, file );
-	const name = path
-		.basename( file )
-		.replace( 'woo-gutenberg-products-block-', '' )
-		.replace( '.po', '' );
-
-	const poContent = fs.readFileSync( filePath );
-	const jsonContent = po2json.parse( poContent, {
-		format: 'jed',
-		stringify: true,
-	} );
-
-	jsFiles.forEach( ( jsFile ) => {
-		const hash = md5( `build/${ jsFile }` );
-		const filename = `woo-gutenberg-products-block-${ name }-${ hash }.json`;
-		if ( showDebug ) {
-			console.log( `   Writing ${ filename }` );
-		}
-		fs.writeFile(
-			path.resolve( './languages/', filename ),
-			jsonContent,
-			( error ) => {
-				if ( error ) {
-					console.warn( 'Error writing the JSON file.' );
-					console.log( error );
-				}
-			}
-		);
-	} );
-} );
-
-console.log( `Done processing language files.` );