Tossing in a basic i18n message export to script code. Plugins can hook StartScriptMe...

Tossing in a basic i18n message export to script code. Plugins can hook StartScriptMessage/EndScriptMessage, or directly add needed mappings in Action::getScriptMessages(). Exported entries are accessible as SN.msg(key) at runtime.
StatusNet core code now sets the tooltip text on .attachment.more links when they receive their attachment-expansion magic; this will override the hardcoded tooltip text saved from OStatus plugin when displaying timelines in the web UI.