feat: Auto detect language on login page access (#2338)

* feat: Auto detect language on login page access

* fix: Apply tommoor suggested changes

* fix: QOL improvements for translators

* fix: consistency fix provider -> authProviderName

Co-authored-by: Tom Moor <tom.moor@gmail.com>

app/components/Authenticated.js

@@ -6,6 +6,7 @@ import { Redirect } from "react-router-dom";
 import { isCustomSubdomain } from "shared/utils/domains";
 import LoadingIndicator from "components/LoadingIndicator";
 import useStores from "../hooks/useStores";
+import { changeLanguage } from "../utils/language";
 import env from "env";
 
 type Props = {
@@ -20,11 +21,7 @@ const Authenticated = ({ children }: Props) => {
   // Watching for language changes here as this is the earliest point we have
   // the user available and means we can start loading translations faster
   React.useEffect(() => {
-    if (language && i18n.language !== language) {
-      // Languages are stored in en_US format in the database, however the
-      // frontend translation framework (i18next) expects en-US
-      i18n.changeLanguage(language.replace("_", "-"));
-    }
+    changeLanguage(language, i18n);
   }, [i18n, language]);
 
   if (auth.authenticated) {

app/scenes/Login/Provider.js

@@ -1,6 +1,7 @@
 // @flow
 import { EmailIcon } from "outline-icons";
 import * as React from "react";
+import { withTranslation, type TFunction } from "react-i18next";
 import styled from "styled-components";
 import AuthLogo from "components/AuthLogo";
 import ButtonLarge from "components/ButtonLarge";
@@ -13,6 +14,7 @@ type Props = {
   authUrl: string,
   isCreate: boolean,
   onEmailSuccess: (email: string) => void,
+  t: TFunction,
 };
 
 type State = {
@@ -56,7 +58,7 @@ class Provider extends React.Component<Props, State> {
   };
 
   render() {
-    const { isCreate, id, name, authUrl } = this.props;
+    const { isCreate, id, name, authUrl, t } = this.props;
 
     if (id === "email") {
       if (isCreate) {
@@ -84,12 +86,12 @@ class Provider extends React.Component<Props, State> {
                   short
                 />
                 <ButtonLarge type="submit" disabled={this.state.isSubmitting}>
-                  Sign In →
+                  {t("Sign In")} →
                 </ButtonLarge>
               </>
             ) : (
               <ButtonLarge type="submit" icon={<EmailIcon />} fullwidth>
-                Continue with Email
+                {t("Continue with Email")}
               </ButtonLarge>
             )}
           </Form>
@@ -104,7 +106,9 @@ class Provider extends React.Component<Props, State> {
           icon={<AuthLogo providerName={id} />}
           fullwidth
         >
-          Continue with {name}
+          {t("Continue with {{ authProviderName }}", {
+            authProviderName: name,
+          })}
         </ButtonLarge>
       </Wrapper>
     );
@@ -122,4 +126,4 @@ const Form = styled.form`
   justify-content: space-between;
 `;
 
-export default Provider;
+export default withTranslation()<Provider>(Provider);

app/scenes/Login/index.js

@@ -3,7 +3,13 @@ import { find } from "lodash";
 import { observer } from "mobx-react";
 import { BackIcon, EmailIcon } from "outline-icons";
 import * as React from "react";
-import { Redirect, Link, type Location } from "react-router-dom";
+import {
+  Trans,
+  withTranslation,
+  type TFunction,
+  useTranslation,
+} from "react-i18next";
+import { Link, type Location, Redirect } from "react-router-dom";
 import styled from "styled-components";
 import { setCookie } from "tiny-cookie";
 import ButtonLarge from "components/ButtonLarge";
@@ -14,6 +20,7 @@ import HelpText from "components/HelpText";
 import OutlineLogo from "components/OutlineLogo";
 import PageTitle from "components/PageTitle";
 import TeamLogo from "components/TeamLogo";
+import { changeLanguage, detectLanguage } from "../../utils/language";
 import Notices from "./Notices";
 import Provider from "./Provider";
 import env from "env";
@@ -22,10 +29,12 @@ import useStores from "hooks/useStores";
 
 type Props = {|
   location: Location,
+  t: TFunction,
 |};
 
-function Login({ location }: Props) {
+function Login({ location, t }: Props) {
   const query = useQuery();
+  const { i18n } = useTranslation();
   const { auth } = useStores();
   const { config } = auth;
   const [emailLinkSentTo, setEmailLinkSentTo] = React.useState("");
@@ -43,6 +52,13 @@ function Login({ location }: Props) {
     auth.fetchConfig();
   }, [auth]);
 
+  // TODO: Persist detected language to new user
+  // Try to detect the user's language and show the login page on its idiom
+  // if translation is available
+  React.useEffect(() => {
+    changeLanguage(detectLanguage(), i18n);
+  }, [i18n]);
+
   React.useEffect(() => {
     const entries = Object.fromEntries(query.entries());
 
@@ -73,11 +89,11 @@ function Login({ location }: Props) {
     env.DEPLOYMENT === "hosted" &&
     (config.hostname ? (
       <Back href={env.URL}>
-        <BackIcon color="currentColor" /> Back to home
+        <BackIcon color="currentColor" /> {t("Back to home")}
       </Back>
     ) : (
       <Back href="https://www.getoutline.com">
-        <BackIcon color="currentColor" /> Back to website
+        <BackIcon color="currentColor" /> {t("Back to website")}
       </Back>
     ));
 
@@ -88,15 +104,17 @@ function Login({ location }: Props) {
         <Centered align="center" justify="center" column auto>
           <PageTitle title="Check your email" />
           <CheckEmailIcon size={38} color="currentColor" />
-
-          <Heading centered>Check your email</Heading>
+          <Heading centered>{t("Check your email")}</Heading>
           <Note>
-            A magic sign-in link has been sent to the email{" "}
-            <em>{emailLinkSentTo}</em>, no password needed.
+            <Trans
+              defaults="A magic sign-in link has been sent to the email <em>{{ emailLinkSentTo }}</em>, no password needed."
+              values={{ emailLinkSentTo: emailLinkSentTo }}
+              components={{ em: <em /> }}
+            />
           </Note>
           <br />
           <ButtonLarge onClick={handleReset} fullwidth neutral>
-            Back to login
+            {t("Back to login")}
           </ButtonLarge>
         </Centered>
       </Background>
@@ -118,13 +136,19 @@ function Login({ location }: Props) {
 
         {isCreate ? (
           <>
-            <Heading centered>Create an account</Heading>
+            <Heading centered>{t("Create an account")}</Heading>
             <GetStarted>
-              Get started by choosing a sign-in method for your new team below…
+              {t(
+                "Get started by choosing a sign-in method for your new team below…"
+              )}
             </GetStarted>
           </>
         ) : (
-          <Heading centered>Login to {config.name || "Outline"}</Heading>
+          <Heading centered>
+            {t("Login to {{ authProviderName }}", {
+              authProviderName: config.name || "Outline",
+            })}
+          </Heading>
         )}
 
         <Notices />
@@ -139,7 +163,9 @@ function Login({ location }: Props) {
             {hasMultipleProviders && (
               <>
                 <Note>
-                  You signed in with {defaultProvider.name} last time.
+                  {t("You signed in with {{ authProviderName }} last time.", {
+                    authProviderName: defaultProvider.name,
+                  })}
                 </Note>
                 <Or />
               </>
@@ -164,7 +190,9 @@ function Login({ location }: Props) {
 
         {isCreate && (
           <Note>
+            <Trans>
               Already have an account? Go to <Link to="/">login</Link>.
+            </Trans>
           </Note>
         )}
       </Centered>
@@ -250,4 +278,4 @@ const Centered = styled(Flex)`
   margin: 0 auto;
 `;
 
-export default observer(Login);
+export default withTranslation()<Login>(observer(Login));

app/utils/language.js

@@ -5,3 +5,11 @@ export function detectLanguage() {
   const region = (r || ln).toUpperCase();
   return `${ln}_${region}`;
 }
+
+export function changeLanguage(toLanguageString, i18n) {
+  if (toLanguageString && i18n.language !== toLanguageString) {
+    // Languages are stored in en_US format in the database, however the
+    // frontend translation framework (i18next) expects en-US
+    i18n.changeLanguage(toLanguageString.replace("_", "-"));
+  }
+}

shared/i18n/locales/en_US/translation.json

@@ -419,6 +419,19 @@
   "Blockquote": "Blockquote",
   "Horizontal divider": "Horizontal divider",
   "Inline code": "Inline code",
+  "Back to home": "Back to home",
+  "Back to website": "Back to website",
+  "Check your email": "Check your email",
+  "A magic sign-in link has been sent to the email <em>{{ emailLinkSentTo }}</em>, no password needed.": "A magic sign-in link has been sent to the email <em>{{ emailLinkSentTo }}</em>, no password needed.",
+  "Back to login": "Back to login",
+  "Create an account": "Create an account",
+  "Get started by choosing a sign-in method for your new team below…": "Get started by choosing a sign-in method for your new team below…",
+  "Login to {{ authProviderName }}": "Login to {{ authProviderName }}",
+  "You signed in with {{ authProviderName }} last time.": "You signed in with {{ authProviderName }} last time.",
+  "Already have an account? Go to <1>login</1>.": "Already have an account? Go to <1>login</1>.",
+  "Sign In": "Sign In",
+  "Continue with Email": "Continue with Email",
+  "Continue with {{ authProviderName }}": "Continue with {{ authProviderName }}",
   "Any collection": "Any collection",
   "Any time": "Any time",
   "Past day": "Past day",