Feature/use hcaptcha if bot (#1089)

* Add captcha to login page

* pull out shared method

* Update parse parameter logic

* Load captcha

* responsive iframe height
* correct i18n
* site key provided by server

* Fix locale parsing

* Add optional success callbackUri

* Make captcha connector responsive

* Handle parameter versions in webauthn

* Move variables to top of script

* Add captcha to registration

* Move captcha above `<hr>` div to be part of input form

* Add styled mobile captcha connector

* Linter Fixes

* Remove duplicate import

* Use listener to load captcha

* PR review

src/scss/styles.scss

@@ -615,6 +615,12 @@ app-user-billing {
     }
 }
 
+#hcaptcha_iframe {
+    width: 100%;
+    border: none;
+    transition: height 0.25s linear;
+}
+
 #bt-dropin-container {
     background: url('../images/loading.svg') 0 0 no-repeat;
     min-height: 50px;