More text strings and some fixes in new lines (2)

Fixed some new line commands and added more text strings to the translation file.

Text string splitting fixed. Thanks Animazing!

lib/gui_lite.py

@@ -218,10 +218,11 @@ class TransactionWindow(QDialog):
 
         self.setModal(True)
         self.resize(200,100)
-        self.setWindowTitle("Transaction successfully sent")
+        self.setWindowTitle(_("Transaction successfully sent"))
 
         self.layout = QGridLayout(self)
-        self.layout.addWidget(QLabel("Your transaction has been sent.\nPlease enter a label for this transaction for future reference."))
+        history_label = "%s\n%s" % (_("Your transaction has been sent."), _("Please enter a label for this transaction for future reference."))
+        self.layout.addWidget(QLabel(history_label))
 
         self.label_edit = QLineEdit()
         self.label_edit.setPlaceholderText(_("Transaction label"))
@@ -621,13 +622,13 @@ class MiniWindow(QDialog):
 
     def backup_wallet(self):
         try:
-          folderName = QFileDialog.getExistingDirectory(QWidget(), 'Select folder to save a copy of your wallet to', os.path.expanduser('~/'))
+          folderName = QFileDialog.getExistingDirectory(QWidget(), _('Select folder to save a copy of your wallet to'), os.path.expanduser('~/'))
           if folderName:
             sourceFile = util.user_dir() + '/electrum.dat'
             shutil.copy2(sourceFile, str(folderName))
-            QMessageBox.information(None,"Wallet backup created", "A copy of your wallet file was created in '%s'" % str(folderName))
+            QMessageBox.information(None,"Wallet backup created", _("A copy of your wallet file was created in")+" '%s'" % str(folderName))
         except (IOError, os.error), reason:
-          QMessageBox.critical(None,"Unable to create backup", "Electrum was unable copy your wallet file to the specified location.\n" + str(reason))
+          QMessageBox.critical(None,"Unable to create backup", _("Electrum was unable to copy your wallet file to the specified location.")+"\n" + str(reason))