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

61% of minimum 50% translated source file: 'dde-launchpad.ts'
on 'nl'.

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

translations/dde-launchpad_nl.ts

@@ -146,22 +146,22 @@
     <message>
         <location filename="../qml/Main.qml" line="36"/>
         <source>Reading</source>
-        <translation type="unfinished"/>
+        <translation>Lezen</translation>
     </message>
     <message>
         <location filename="../qml/Main.qml" line="38"/>
         <source>Development</source>
-        <translation type="unfinished"/>
+        <translation>Ontwikkeling</translation>
     </message>
     <message>
         <location filename="../qml/Main.qml" line="40"/>
         <source>System</source>
-        <translation type="unfinished"/>
+        <translation>Systeem</translation>
     </message>
     <message>
         <location filename="../qml/Main.qml" line="42"/>
         <source>Others</source>
-        <translation type="unfinished"/>
+        <translation>Overig</translation>
     </message>
     <message>
         <location filename="../qml/Main.qml" line="398"/>