Implemented UI for Accounts applications management.

Introduced copy service and injected it usage into auth finish page.
Introduced Collapse component.
Introduced Radio component.
Generalized Checkbox component to share Radio component styles.
Improved Textarea component: it now has auto height functionality.
Improved profile/BackButton component: now you can pass custom url.
BSOD is no longer displayed on 404 response.

src/components/dev/apps/applicationForm/ApplicationForm.js

@@ -0,0 +1,129 @@
+// @flow
+import React, { Component } from 'react';
+import { FormattedMessage as Message } from 'react-intl';
+import { Helmet } from 'react-helmet';
+
+import { Form, FormModel, Button } from 'components/ui/form';
+import { BackButton } from 'components/profile/ProfileForm';
+import { COLOR_GREEN } from 'components/ui';
+
+import { TYPE_APPLICATION, TYPE_MINECRAFT_SERVER } from 'components/dev/apps';
+import styles from 'components/profile/profileForm.scss';
+import messages from './ApplicationForm.intl.json';
+
+import ApplicationTypeSwitcher from './ApplicationTypeSwitcher';
+import WebsiteType from './WebsiteType';
+import MinecraftServerType from './MinecraftServerType';
+
+import type { ComponentType } from 'react';
+import type { MessageDescriptor } from 'react-intl';
+import type { OauthAppResponse } from 'services/api/oauth';
+
+const typeToForm: {
+    [key: string]: {
+        label: MessageDescriptor,
+        component: ComponentType<any>,
+    },
+} = {
+    [TYPE_APPLICATION]: {
+        label: messages.website,
+        component: WebsiteType,
+    },
+    [TYPE_MINECRAFT_SERVER]: {
+        label: messages.minecraftServer,
+        component: MinecraftServerType,
+    },
+};
+
+const typeToLabel: {
+    [key: string]: MessageDescriptor,
+} = Object.keys(typeToForm).reduce((result, key: string) => {
+    result[key] = typeToForm[key].label;
+    return result;
+}, {});
+
+export default class ApplicationForm extends Component<{
+    app: OauthAppResponse,
+    form: FormModel,
+    displayTypeSwitcher?: bool,
+    type: ?string,
+    setType: (string) => void,
+    onSubmit: (FormModel) => Promise<*>,
+}> {
+    static displayName = 'ApplicationForm';
+
+    static defaultProps = {
+        setType: () => {},
+    };
+
+    render() {
+        const { type, setType, form, displayTypeSwitcher, app } = this.props;
+        const { component: FormComponent } = type && typeToForm[type] || {};
+        const isUpdate = app.clientId !== '';
+
+        return (
+            <Form form={form} onSubmit={this.onFormSubmit}>
+                <div className={styles.contentWithBackButton}>
+                    <BackButton to="/dev/applications" />
+
+                    <div className={styles.form}>
+                        <div className={styles.formBody}>
+                            <Message {...(isUpdate ? messages.updatingApplication : messages.creatingApplication)}>
+                                {(pageTitle: string) => (
+                                    <h3 className={styles.title}>
+                                        <Helmet title={pageTitle} />
+                                        {pageTitle}
+                                    </h3>
+                                )}
+                            </Message>
+
+                            {displayTypeSwitcher && (
+                                <div className={styles.formRow}>
+                                    <ApplicationTypeSwitcher
+                                        selectedType={type}
+                                        setType={setType}
+                                        appTypes={typeToLabel}
+                                    />
+                                </div>
+                            )}
+
+                            {!FormComponent && (
+                                <div className={styles.formRow}>
+                                    <p className={styles.description}>
+                                        <Message {...messages.toDisplayRegistrationFormChooseType} />
+                                    </p>
+                                </div>
+                            )}
+
+                            {FormComponent && <FormComponent form={form} app={app} />}
+                        </div>
+                    </div>
+
+                    {FormComponent && (
+                        <Button
+                            color={COLOR_GREEN}
+                            block
+                            label={isUpdate ? messages.updateApplication : messages.createApplication}
+                            type="submit"
+                        />
+                    )}
+                </div>
+            </Form>
+        );
+    }
+
+    onFormSubmit = async () => {
+        const { form } = this.props;
+
+        try {
+            await this.props.onSubmit(form);
+        } catch (resp) {
+            if (resp.errors) {
+                form.setErrors(resp.errors);
+                return;
+            }
+
+            throw resp;
+        }
+    };
+}