Call msg ->text() or escaped() instead of parse()

Done for flow-paging-rev/fwd in getPagingLink() and
'flow-topic-participants' in printParticipants(), there are about 12
other invocations of parse() in Flow PHP.

Bug: 59644
Change-Id: Ibcc8220cdf30fdae8506c770cb51b2f0257b5a59
Merge "Call msg ->text() or escaped() instead of parse()"