OC-2587:Add new string to setup.xml: share_api_link

res/values/setup.xml

@@ -14,6 +14,7 @@
     <bool name="show_server_url_input">true</bool>
     <bool name="show_welcome_link">true</bool>
 	<string name="welcome_link_url">"https://owncloud.com/mobile/new"</string>
+	<string name="share_api_link"></string>
     
     <!-- Flags to setup the authentication methods available in the app -->
     <string name="auth_method_oauth2">off</string>