fixes #2989 - missing fields in host API output (API v1 and v2)
fixes #3059 - new mail rake task sends foreman reports to each user
fixes #2942 - plugin i18n support

This is first phase of plugins i18n support. More to come later:

 * Extraction from model classes
 * JavaScript extraction and support
Links to hostgroups are consistent, don't go to hostgroup edit, and do a correct search

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