i18n: Translate network_en_US.ts in pl

97% of minimum 50% translated source file: 'network_en_US.ts'
on 'pl'.

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

Author: transifex-integration[bot]

dcc-network/translations/network_pl.ts

@@ -1717,7 +1717,7 @@
     <name>network</name>
     <message>
         <source>Network</source>
-        <translation type="unfinished"/>
+        <translation>Sieć</translation>
     </message>
 </context>
 </TS>