diff --git a/res/values/strings.xml b/res/values/strings.xml
index 6e3ebc5a6..6c47f361b 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -11,6 +11,8 @@
     <string name="def">Default</string>
     <string name="custom">Custom</string>
     <string name="none">None</string>
+    <string name="automatic">Automatic</string>
+    <string name="strict">Strict</string>
     <string name="open">Open</string>
     <string name="delete">Delete</string>
     <string name="update">Update</string>
@@ -338,6 +340,10 @@
     <!-- Translators: %1$s will be replaced by the server name (eg. imap.somewhere.org) and %2$s will be replaced by the human-readable response from the server. this response may be a single word or some sentences and may or may not be localized. -->
     <string name="login_error_server_response">Response from %1$s: %2$s\n\nSome providers place additional information in your inbox; you can check them it eg. in the web frontend. Consult your provider or friends if you run into problems.</string>
 
+    <!-- TLS certificate checks -->
+    <string name="accept_invalid_hostnames">Accept invalid hostnames</string>
+    <string name="accept_invalid_certificates">Accept invalid certificates</string>
+
 
     <!-- share and forward messages -->
     <!-- Translators: Title shown above a chat/contact list; the user selects the recipient of the messages he wants to forward to -->