1. Yes when: for example when you add a phrase, you choose a product it belongs to then when the product uninstalled the phrases belong to that product will be removed too.
2. I haven't found a way to add custom phrases for Permission, Error Messages, etc (which are some phrase types). So currently it's only possible to add global phrases. The psiStats may use queries in its product installation files (xml for example). add_phrase_type just do the same, it also runs queries but it's written by vbulletin development staves so what would you choose ?
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