Previously we could put into a message a string where escape sequences
were already translated.

In the code, now we pass the original text together with the one
that is actually searched for.  New `original_text' field was added to
GeanySearchData.  A bug was fixed in document.c:show_replace_summary(): it
did not escape the "No matches found for ..." string.

Patch by Eugene Arshinov, thanks.

git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/trunk@5832 ea778897-0a13-0410-b9d1-a72fbfd435f5