I10N: First translation fixes for 2.1

Fix README, some spelling errors, remove contractions,
exclamation marks, correct some plural forms, join split messages.
Add QCoreApplication::translate to non-Q_OBJECT-classes.
Fix some lupdate warnings about discarding meta-data (//:).

src/plugins/qt4projectmanager/qt-maemo/maemopackagecreationstep.cpp

@@ -222,7 +222,7 @@ bool MaemoPackageCreationStep::copyDebianFiles()
     }
     QDir buildDir(buildDirectory());
     if (!buildDir.mkdir("debian")) {
-        raiseError(tr("Could not create debian directory '%1'.")
+        raiseError(tr("Could not create Debian directory '%1'.")
                    .arg(debianDirPath));
         return false;
     }