Added missing translations in the italian translation

translations/it.ts

@@ -2358,6 +2358,14 @@ Se non sei sicuro, scegli "No", così le informazioni inviate al serve
         <source>Add friend</source>
         <translation>Aggiungi contatto</translation>
     </message>
+    <message>
+        <source>By Name</source>
+        <translation>Per nome</translation>
+    </message>
+    <message>
+        <source>By Activity</source>
+        <translation>Per attività</translation>
+    </message>
     <message>
         <location filename="../src/widget/widget.cpp" line="1473"/>
         <source>All</source>