[skip CI] Translate dde-launchpad.ts in pl

97% of minimum 50% translated source file: 'dde-launchpad.ts'
on 'pl'.

Sync of partially translated files: 
untranslated content is included with an empty translation 
or source language content depending on file format

translations/dde-launchpad_pl.ts

@@ -116,7 +116,7 @@
     <message>
         <location filename="../qml/FullscreenFrame.qml" line="152"/>
         <source>Window Mode</source>
-        <translation type="unfinished"/>
+        <translation>Tryb okna</translation>
     </message>
 </context>
 <context>