Fix bug of not localize Menu and Context-Menu

[juggernautjp]

Requirements for Contributing a Bug Fix

This fix enable atom-i18n to localize "Welcome Guide" and "Telemetry Consent" views.

Identify the Bug

atom-i18n can not localize "Packages" menu, GitHub menus in "View" and "Context Menu.

The above bugs are opened as the following:

1. Issue #299
2. Issue #321

Description of the Change

• add feature of localizing 'Packages' menu for Atom Core Packages, which is bundled at the release.
• modify the existing files of def/*/context.cson and def/*/menu_{darwin, linux, win32}.cson
• localize all strings to Japanese in def/ja/*.cson
• Also, end-of-line code of all files that are modified, are 'CRLF' (Windows format)
• The branch is fix/not-localize-menus

Alternate Designs

None

Possible Drawbacks

None, I think.

Verification Process

1. All locale files, such as def/ja/context.cson, are tested with npm run validation -- --locale.
2. All locale files are tested on Atom editor with atom-i18n, by manually changing locale.

Release Notes

• All Menu and Context Menu are able to be localized in your language.

[liuderchi]

@juggernautjp Thank you so much for such a great contribution! 🙇‍♂️