Here is described use case for searchquery, the provided you searchresults limited for your favoured channel.

One Example. Here query for the channel Hubzilla Support Forum:Attention! You must logged into Hubzilla to be! #^http://hub2.sprechrun.de/?f=support&search=maria

With f=support define you a filtering for searchresults exclusively from channel with webname filter support. The webname of your favoured channel is defined in the channel address before @-character.  When you activate the option Settings
   -> Additional Features -> Network and Stream Filtering -> Saved Searches, then you can save und reuse your searchquerys. Saved Searches will be displayed at your Gridpage /network . For example:



Edit 12-05-2017

for language filtering use the not-safe-for-work plugin settings and add 'lang!=en' as a filter. You can do the same with connection filters but this is an advanced feature and only applies to each connection. Using the not-safe-for-work plugin for language filtering which catch everything in your stream which has enough text to guess the language.

Mike Macgirvin