URL checker

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

@@ -979,4 +979,5 @@
     <string name="examplesWriteSecureSettings">I do not keep a list of possible settings. Please find those settings on your own. See <a href="https://developer.android.com/reference/android/provider/Settings.Secure">here</a> for some (incomplete) examples.</string>
     <string name="httpParametersExplanation">If any parameter name starts with %1$s while method is POST, it will not be transmitted like the other parameters (with key=value), but transferred as main data. If the parameter ends with %2$s, no encoding will be performed.</string>
     <string name="target">Target</string>
+    <string name="enter_valid_url">Enter a valid URL.</string>
 </resources>