`babel.Translations.load({...}).install()` from a plugin breaks the loaded translations catalog

[Jun Omae]

generate_messages_js command of setuptools works for Trac and Trac plugins. The command generates "messages file for javascript" as the following;

// Generated messages javascript file from compiled MO file
babel.Translations.load({"domain":"{plugin-name}-js",...}).install();

The babel.Translations.install() installs _, genetext and ngettext functions binded the loaded translations instance to window instance.

When a plugin loads the messages catalog for javascript, Therefore, it overwrites the last installed functions (maybe from trac/htdocs/messages/*.js) and messages for Trac will not be translated.