Add "forgot password URL" editing functionality

Concludes fix of Haufe-Lexware/wicked.haufe.io#185

Author: DonMartin76

public/js/authserver.js

@@ -118,6 +118,7 @@ Vue.component('auth-method', {
         <div v-else-if="value.type == 'external'">
             <wicked-input v-model="value.config.validateUserPassUrl" label="URL to validate username/password:" :env-var="envPrefix + 'USERPASSURL'" hint="The auth server will POST to this URL to validate username and password, and expects a well-formed response. See <a href='https://apim-haufe-io.github.io/wicked.node-sdk/interfaces/_interfaces_.externaluserpassrequest.html' target='_blank'>ExternalUserPassRequest</a> and <a href='https://apim-haufe-io.github.io/wicked.node-sdk/interfaces/_interfaces_.externaluserpassresponse.html' target='_blank'>ExternalUserPassResponse</a>." />
             <wicked-input v-model="value.config.allowRefreshUrl" label="URL for refreshing tokens:" :env-var="envPrefix + 'REFRESHURL'" hint="The auth server will POST to this URL to check whether it is allowed to refresh a token, and expects a well-formed response. See <a href='https://apim-haufe-io.github.io/wicked.node-sdk/interfaces/_interfaces_.externalrefreshrequest.html' target='_blank'>ExternalRefreshRequest</a> and <a href='https://apim-haufe-io.github.io/wicked.node-sdk/interfaces/_interfaces_.externalrefreshresponse.html' target='_blank'>ExternalRefreshResponse</a>." />
+            <wicked-input v-model="value.config.forgotPasswordUrl" label="URL for resetting password:" :env-var="envPrefix + 'FORGOTPASSWORD'" hint="In case the external source has a web page which can be used to retrieve or reset passwords, you can specify it here, and it will be displayed as a 'Forgot password?' link on the login page." />
         </div>
         <div v-else-if="value.type == 'google'">
             <wicked-input v-model="value.config.clientId" label="Google client ID:" hint="The Google client ID for the wicked API Portal" :env-var="envPrefix + 'CLIENTID'"/>