Fixing Greek and Lithuanian languages

app/src/main/res/values-lt/strings.xml

@@ -30,10 +30,11 @@
     <string name="action_webpage">Tinklalapis</string>
     <string name="action_yes">Taip</string>
     <string name="agent">Naudotojo agentas</string>
-    <string name="agent_custom"></string>
-    <string name="agent_desktop"></string>
-    <string name="agent_mobile"></string>
-    <string name="faq"></string>
+    <string name="agent_default">Default</string>
+    <string name="agent_desktop">Desktop</string>
+    <string name="agent_mobile">Mobile</string>
+    <string name="agent_custom">Custom</string>
+    <string name="faq">FAQ</string>
     <string name="yes">Taip</string>
     <string name="reading_mode">Skaitymo rėžimas</string>
     <string name="no">Ne</string>