mod_http_muc_log: Move language attribute onto body itself One could argue that it's mostly the message that is in a particular language, while the timestamp is less so. What language a particular nickname is, and its relation to the language in the text, that is an unresolved question.

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summary: Remote Roster Management
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Introduction
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This module adds support for [XEP-0321: Remote Roster Management] which
is commonly used to allow components such as transports to modify the
rosters of local users.