PrintView improvements (#250)

- Allow printer selection directly from PrintView
- Print button bypasses the system print dialog, since label printing is quite different from typical printing tasks
- Separate button to optionally use system print dialog, if needed

translations/glabels_C.ts

@@ -619,11 +619,19 @@
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <source>Print...</source>
+        <source>Start groups at position:</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <source>Start groups at position:</source>
+        <source>Destination</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <source>Print</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <source>Use system print dialog...</source>
         <translation type="unfinished"></translation>
     </message>
 </context>
@@ -2113,6 +2121,22 @@
         <source>(Will print a total of %1 items on 1 page.)</source>
         <translation type="unfinished"></translation>
     </message>
+    <message>
+        <source>Print to file (PDF)</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <source>PDF files (*.pdf);;All files (*)</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <source>%1 already exists.</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <source>Do you want to overwrite it?</source>
+        <translation type="unfinished"></translation>
+    </message>
 </context>
 <context>
     <name>glabels::PropertiesView</name>