Use "done" button to close license dialogs.

Rename string res "recaptcha_done_button" to "done".

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

@@ -441,7 +441,7 @@
     <string name="systems_language">सिस्टम पूर्वनिर्धारित</string>
     <string name="title_activity_recaptcha">reCAPTCHA चुनौती</string>
     <string name="subtitle_activity_recaptcha">प्रेस हल गर्दा \"डन\"</string>
-    <string name="recaptcha_done_button">सकियो</string>
+    <string name="done">सकियो</string>
     <string name="videos_string">भिडियोहरु</string>
     <plurals name="seconds">
         <item quantity="one">%d सेकेन्ड</item>