mod_invites_page: Change client selection button text from 'Install' to 'Select' by default This also allows specific clients entries to override the text via the 'select_text' field. Rationale: 1) users may already have the software installed, we still want them to select it anyway for the tailored setup experience. 2) some clients (e.g. web clients) are not really "installed" so the text was misleading

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summary: Lets users create and join roster groups
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Introduction
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This module lets you join groups using an ad-hoc command. When a user
joins a group, everyone in the group is added to their roster, and they
are added to the rosters of existing members.

TODO
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-   Leaving groups
-   Add a roster group/tag when adding roster items (tricky with current
    rostermanager API)