The stream/topic edit areas now have these ids:
#stream_message_recipient_stream
#stream_message_recipient_topic
They are pretty verbose, but being able to grep
for these without noise does have some value.
Use CSS to display a `+` button on mobile but keep the more verbose
buttons on desktop. In the future, this button will be used to display
a popop for a new message.
Fixes#9433.
Extra bottom margin was observed when using `compose_error` which
was caused by paragraphs in bootstrap having a bottom margin of 10px.
The paragraph tag has been replaced by a span tag.
This should make it easier to find the templates that are actually
part of the core webapp, instead of having them all mixed together
with the portico pages.