Added text

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

@@ -694,6 +694,7 @@
     <string name="title_no_openpgp">OpenKeychain not found</string>
     <string name="title_not_encrypted">Message is not encrypted</string>
     <string name="title_reset_sign_key">Reset sign key</string>
+    <string name="title_import_encrypt_key">Import encryption key</string>
 
     <string name="title_signature_none">Message not signed</string>
     <string name="title_signature_valid">Message signature valid</string>