[GAPRINDASHVILI] locale:po_to_json: add support for including catalogs from js plugins

[mzazrivec]

This is gaprindashvili version of #17725

When creating gettext catalogs for javascript consumption, we need to merge catalogs from all ManageIQ plugins and convert the result into a json file. So far, we were only able to do that for regular rails engines (i.e. ManageIQ ruby plugins). As things are, we need to include javascript plugins (such as ui-compoments) into the equation as well.

This change makes it possible to download the gettext catalogs from plugins and include them into the merge & conversion process.

(cherry picked from commit 60bac82)

https://bugzilla.redhat.com/show_bug.cgi?id=1592571

[miq-bot]

Checked commit mzazrivec@23aed0a with ruby 2.3.3, rubocop 0.52.1, haml-lint 0.20.0, and yamllint 1.10.0
1 file checked, 7 offenses detected

lib/tasks/locale.rake

• ❗ - Line 195, Col 15 - Rails/FilePath - Please use Rails.root.join('path', 'to') instead.
• ❗ - Line 196, Col 15 - Rails/FilePath - Please use Rails.root.join('path', 'to') instead.
• ❗ - Line 219, Col 21 - Rails/FilePath - Please use Rails.root.join('path', 'to') instead.
• ❗ - Line 220, Col 30 - Style/NumericLiteralPrefix - Use 0o for octal literals.
• ❗ - Line 234, Col 22 - Rails/FilePath - Please use Rails.root.join('path', 'to') instead.
• ❗ - Line 235, Col 31 - Style/NumericLiteralPrefix - Use 0o for octal literals.
• ❗ - Line 239, Col 24 - Style/NumericLiteralPrefix - Use 0o for octal literals.

[JPrause]

@miq-bot add_label blocker

[JPrause]

@martinpovolny did you need to review further before this is merged.

[martinpovolny]

👍

[JPrause]

@simaishi with Martin's approval, will you be doing the merge.