add licence note for okhttp to about page

app/src/main/res/layout/about.xml

@@ -134,6 +134,21 @@
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:text="@string/copyright_openssl" />
+
+        <Space
+            android:layout_width="match_parent"
+            android:layout_height="20sp" />
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/okhttp"
+            android:textAppearance="?android:attr/textAppearanceMedium" />
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/copyright_okhttp" />
     </LinearLayout>
 
 </ScrollView>

app/src/main/res/values/untranslatable.xml

@@ -4,21 +4,22 @@
 	<string name="app_name" translatable="false">Bitmask</string>
     <string name="notifcation_title_bitmask">Bitmask - %s</string>
 
-    <string name="copyright_leapgui" translatable="false">Copyright 2012-2014\nLEAP Encryption Access Project &lt;info@leap.se></string>
+    <string name="copyright_leapgui" translatable="false">Copyright 2012-2017\nLEAP Encryption Access Project &lt;info@leap.se></string>
     <string name="opevpn_copyright" translatable="false">Copyright © 2002–2010 OpenVPN Technologies, Inc. &lt;sales@openvpn.net>\n
-
 	  "OpenVPN" is a trademark of OpenVPN Technologies, Inc.</string>
     <string name="lzo_copyright" translatable="false">Copyright © 1996 – 2011 Markus Franz Xaver Johannes Oberhumer</string>
     <string name="copyright_openssl" translatable="false">        This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit\n
         Copyright © 1998-2008 The OpenSSL Project. All rights reserved.\n\n
         This product includes cryptographic software written by Eric Young (eay@cryptsoft.com)\n
         Copyright © 1995-1998 Eric Young (eay@cryptsoft.com) All rights reserved.</string>
+    <string name="copyright_okhttp" translatable="false">Copyright Copyright 2016 Square, Inc.</string>
+    <string name="okhttp" translatable="false">OkHttp</string>
     <string name="openvpn" translatable="false">OpenVPN</string>
     <string name="lzo" translatable="false">LZO</string>
     <string name="openssl" translatable="false">OpenSSL</string>
     <string name="unknown_state" translatable="false">Unknown state</string>
 
-    <string name="copyright_blinktgui" translatable="false">Copyright 2012–2014 Arne Schwabe &lt;arne@rfc2549.org></string>
+    <string name="copyright_blinktgui" translatable="false">Copyright 2012–2017 Arne Schwabe &lt;arne@rfc2549.org></string>
 
     <string name="defaultserver" translatable="false">openvpn.uni-paderborn.de</string>
     <string name="defaultport" translatable="false">1194</string>