Reword some translatable strings

We've decided to use the term "Usage Statistics Reporting"
instead of "Analytics" in user-facing strings.

Source/Core/DolphinQt/Main.cpp

@@ -184,7 +184,7 @@ int main(int argc, char* argv[])
 
       analytics_prompt.setIcon(QMessageBox::Question);
       analytics_prompt.setStandardButtons(QMessageBox::Yes | QMessageBox::No);
-      analytics_prompt.setWindowTitle(QObject::tr("Allow analytics"));
+      analytics_prompt.setWindowTitle(QObject::tr("Allow Usage Statistics Reporting"));
       analytics_prompt.setText(
           QObject::tr("Do you authorize Dolphin to report information to Dolphin's developers?"));
       analytics_prompt.setInformativeText(