This PR introduces Qt translator comments for Connection Type strings in guiutil.cpp as well as rpcconsole.cpp.
This is an alternate implementation of the idea presented in the last three commits of #289. It is especially inspired by commit 842f4e834dfe5fd2786a5092f78ea28da1b36e4f.
Per Qt Dev Notes, it is better to not break up strings when not necessary. This way we preserve the full context for translators.