[ticket/11642] generate_text_for_display on mcp/mcp_post.php

sub-task of ticket PHPBB3-11635:
find and fix all bypasses of generate_text_for_*

PHPBB3-11642
[ticket/11642] Fixed typo in the variable name.

sub-task of ticket PHPBB3-11635:
find and fix all bypasses of generate_text_for_*

PHPBB3-11642
[ticket/11642] Use $parse_flags

sub-task of ticket PHPBB3-11635:
find and fix all bypasses of generate_text_for_*

PHPBB3-11642
Merge remote-tracking branch 'brunoais/ticket/11642' into develop

* brunoais/ticket/11642:
  [ticket/11642] Use $parse_flags
  [ticket/11642] Fixed typo in the variable name.
  [ticket/11642] generate_text_for_display on mcp/mcp_post.php