[wp-meta] [Making WordPress.org] #3876: Update wporg-gp-customizations to generate language packs for each JS file.

[Making WordPress.org]

#3876: Update wporg-gp-customizations to generate language packs for each JS file.
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 Reporter:  herregroen                |      Owner:  (none)
     Type:  enhancement               |     Status:  new
 Priority:  normal                    |  Milestone:
Component:  Translate Site & Plugins  |   Keywords:
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 In order to support javascript language packs and allow these to be
 selectively loaded as described in #3875 wordpress.org will need to be
 able to generate language packs for each JS file.

 Currently a single language pack is generated in the `Language_Pack` class
 during the `build_language_packs` function.

 Translation entries are retrieved from GlotPress and all of these are
 always added to the PO file.

 This should be changed so these translation entries are split according to
 their references.

 Before building PO files all translation entries should be looped over and
 a mapping should be created of filenames to an array of translation
 entries. In this mapping there should be a single entry for all
 translations that occur in PHP files and an entry for every single JS file
 present in the translation references containing the appropriate
 translations.

 For each entry in this mapping a different PO and MO file should be
 created. These should all be added to the same ZIP the current PO and MO
 files are added to.

 The filenames of the generated files for each JS file should be in the
 format of `{$domain}-{$path}-{$locale}`. Where `$path` is the full path to
 the JS file with path separators replaced by dashes. For example, the file
 `js/src/script.js` containing translations in the `example` domain would
 resolve to the filename `example-js-src-script-nl_NL` for translations of
 the `nl_NL` locale.

 Doing this will ensure all language packs are ready to be included
 selectively in WordPress and only translations that are needed will be
 loaded.

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Ticket URL: <https://meta.trac.wordpress.org/ticket/3876>
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