a few more untranslated strings

git-svn-id: https://plugins.svn.wordpress.org/updraftplus/trunk@756550 b8457f37-d9ea-0310-8a92-e5e31aec5664
FTP settings test button tweak

git-svn-id: https://plugins.svn.wordpress.org/updraftplus/trunk@756555 b8457f37-d9ea-0310-8a92-e5e31aec5664