Make linkshere-related messages backward compatible

Make linkshere-related messages backward compatible

With I11e663cbce32b4199f16df6ed1e9b980630ece7a we changed message
parsing and message name, which broke some customized messages where $1
was used for various purposed as the page title. This patch shifts
message parameters so to still pass plain title as $1 while keeping HTML
link as $2. This won't change parsing method (still HTML since we use an
HTML link), nor message key (still with "-2") due to different parsing
method.

Bug: T189860
Change-Id: I68a8639a61237c67deb61aefd5360dea3cced6cd