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/scenes/CollectionNew.js

@@ -3,6 +3,7 @@ import { intersection } from "lodash";
 import { observable } from "mobx";
 import { inject, observer } from "mobx-react";
 import * as React from "react";
+import { withTranslation, type TFunction } from "react-i18next";
 import { withRouter, type RouterHistory } from "react-router-dom";
 import CollectionsStore from "stores/CollectionsStore";
 import UiStore from "stores/UiStore";
@@ -20,6 +21,7 @@ type Props = {
   ui: UiStore,
   collections: CollectionsStore,
   onSubmit: () => void,
+  t: TFunction,
 };
 
 @observer
@@ -84,7 +86,7 @@ class CollectionNew extends React.Component<Props> {
     this.hasOpenedIconPicker = true;
   };
 
-  handleDescriptionChange = (getValue) => {
+  handleDescriptionChange = (getValue: () => string) => {
     this.description = getValue();
   };
 
@@ -98,17 +100,19 @@ class CollectionNew extends React.Component<Props> {
   };
 
   render() {
+    const { t } = this.props;
+
     return (
       <form onSubmit={this.handleSubmit}>
         <HelpText>
-          Collections are for grouping your knowledge base. They work best when
-          organized around a topic or internal team — Product or Engineering for
-          example.
+          {t(
+            "Collections are for grouping your knowledge base. They work best when organized around a topic or internal team — Product or Engineering for example."
+          )}
         </HelpText>
         <Flex>
           <Input
             type="text"
-            label="Name"
+            label={t("Name")}
             onChange={this.handleNameChange}
             value={this.name}
             required
@@ -124,29 +128,33 @@ class CollectionNew extends React.Component<Props> {
           />
         </Flex>
         <InputRich
-          label="Description"
+          label={t("Description")}
           onChange={this.handleDescriptionChange}
           defaultValue={this.description || ""}
-          placeholder="More details about this collection…"
+          placeholder={t("More details about this collection…")}
           minHeight={68}
           maxHeight={200}
         />
         <Switch
           id="private"
-          label="Private collection"
+          label={t("Private collection")}
           onChange={this.handlePrivateChange}
           checked={this.private}
         />
         <HelpText>
-          A private collection will only be visible to invited team members.
+          {t(
+            "A private collection will only be visible to invited team members."
+          )}
         </HelpText>
 
         <Button type="submit" disabled={this.isSaving || !this.name}>
-          {this.isSaving ? "Creating…" : "Create"}
+          {this.isSaving ? t("Creating…") : t("Create")}
         </Button>
       </form>
     );
   }
 }
 
-export default inject("collections", "ui")(withRouter(CollectionNew));
+export default withTranslation()<CollectionNew>(
+  inject("collections", "ui")(withRouter(CollectionNew))
+);