[skip CI] Translate dde-dock.ts in pt

57% of minimum 50% translated source file: 'dde-dock.ts'
on 'pt'.

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

plugins/dde-dock/translations/dde-dock_pt.ts

@@ -323,15 +323,15 @@
     </message>
     <message>
         <source>Off</source>
-        <translation type="unfinished"/>
+        <translation>Desligado</translation>
     </message>
     <message>
         <source>Light</source>
-        <translation type="unfinished"/>
+        <translation>Claro</translation>
     </message>
     <message>
         <source>Dark</source>
-        <translation type="unfinished"/>
+        <translation>Escuro</translation>
     </message>
     <message>
         <source>Auto</source>