feat: I18n (#1653)

* feat: i18n

* Changing language single source of truth from TEAM to USER

* Changes according to @tommoor comments on PR

* Changed package.json for build:i18n and translation label

* Finished 1st MVP of i18n for outline

* new translation labels & Portuguese from Portugal translation

* Fixes from PR request

* Described language dropdown as an experimental feature

* Set keySeparator to false in order to cowork with html keys

* Added useTranslation to Breadcrumb

* Repositioned <strong> element

* Removed extra space from TemplatesMenu

* Fortified the test suite for i18n

* Fixed trans component problematic

* Check if selected language is available

* Update yarn.lock

* Removed unused Trans

* Removing debug variable from i18n init

* Removed debug variable

* test: update snapshots

* flow: Remove decorator usage to get proper flow typing
It's a shame, but hopefully we'll move to Typescript in the next 6 months and we can forget this whole Flow mistake ever happened

* translate: Drafts

* More translatable strings

* Mo translation strings

* translation: Search

* async translations loading

* cache translations in client

* Revert "cache translations in client"

This reverts commit 08fb61ce36384ff90a704faffe4761eccfb76da1.

* Revert localStorage cache for cache headers

* Update Crowdin configuration file

* Moved translation files to locales folder and fixed english text

* Added CONTRIBUTING File for CrowdIn

* chore: Move translations again to please CrowdIn

* fix: loading paths
chore: Add strings for editor

* fix: Improve validation on documents.import endpoint

* test: mock bull

* fix: Unknown mimetype should fallback to Markdown parsing if markdown extension (#1678)

* closes #1675

* Update CONTRIBUTING

* chore: Add link to translation portal from app UI

* refactor: Centralize language config

* fix: Ensure creation of i18n directory in build

* feat: Add language prompt

* chore: Improve contributing guidelines, add link from README

* chore: Normalize tab header casing

* chore: More string externalization

* fix: Language prompt in dark mode

Co-authored-by: André Glatzl <andreglatzl@gmail.com>

app/menus/NewChildDocumentMenu.js

@@ -2,6 +2,7 @@
 import { observable } from "mobx";
 import { observer, inject } from "mobx-react";
 import * as React from "react";
+import { withTranslation, type TFunction } from "react-i18next";
 import { Redirect } from "react-router-dom";
 
 import CollectionsStore from "stores/CollectionsStore";
@@ -14,6 +15,7 @@ type Props = {
   label?: React.Node,
   document: Document,
   collections: CollectionsStore,
+  t: TFunction,
 };
 
 @observer
@@ -39,7 +41,7 @@ class NewChildDocumentMenu extends React.Component<Props> {
   render() {
     if (this.redirectTo) return <Redirect to={this.redirectTo} push />;
 
-    const { label, document, collections } = this.props;
+    const { label, document, collections, t } = this.props;
     const collection = collections.get(document.collectionId);
 
     return (
@@ -49,14 +51,16 @@ class NewChildDocumentMenu extends React.Component<Props> {
             {
               title: (
                 <span>
-                  New document in{" "}
-                  <strong>{collection ? collection.name : "collection"}</strong>
+                  {t("New document in")}{" "}
+                  <strong>
+                    {collection ? collection.name : t("collection")}
+                  </strong>
                 </span>
               ),
               onClick: this.handleNewDocument,
             },
             {
-              title: "New nested document",
+              title: t("New nested document"),
               onClick: this.handleNewChild,
             },
           ]}
@@ -66,4 +70,6 @@ class NewChildDocumentMenu extends React.Component<Props> {
   }
 }
 
-export default inject("collections")(NewChildDocumentMenu);
+export default withTranslation()<NewChildDocumentMenu>(
+  inject("collections")(NewChildDocumentMenu)
+);