Add string.

app/src/main/res/values-pt-rBR/strings.xml

@@ -14,6 +14,7 @@
 
     <!-- Regular information messages -->
     <string name="msg_no_internet_connection">Sem conexão à internet</string>
+    <string name="msg_generic_error">Desculpe, ocorreu um erro, tente novamente</string>
     <string name="msg_username">nome de usuário</string>
     <string name="msg_username_or_email">nome de usuário ou email</string>
     <string name="msg_password">senha</string>

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

@@ -15,6 +15,7 @@
 
     <!-- Regular information messages -->
     <string name="msg_no_internet_connection">No internet connection</string>
+    <string name="msg_generic_error">Sorry, an error has occurred, please try again</string>
     <string name="msg_username">username</string>
     <string name="msg_username_or_email">username or email</string>
     <string name="msg_password">password</string>