Get isRtl from scratch-l10n

Also added jsdoc to locale-utils

Author: chrisgarrity

src/components/sprite-selector/sprite-selector.jsx

@@ -7,7 +7,7 @@ import SpriteInfo from '../../containers/sprite-info.jsx';
 import SpriteList from './sprite-list.jsx';
 import ActionMenu from '../action-menu/action-menu.jsx';
 import {STAGE_DISPLAY_SIZES} from '../../lib/layout-constants';
-import {rtlLocales} from '../../lib/locale-utils';
+import {isRtl} from 'scratch-l10n';
 
 import styles from './sprite-selector.css';
 
@@ -140,7 +140,7 @@ const SpriteSelectorComponent = function (props) {
                     }
                 ]}
                 title={intl.formatMessage(messages.addSpriteFromLibrary)}
-                tooltipPlace={rtlLocales.indexOf(intl.locale) === -1 ? 'left' : 'right'}
+                tooltipPlace={isRtl(intl.locale) ? 'left' : 'right'}
                 onClick={onNewSpriteClick}
             />
         </Box>

src/lib/locale-utils.js

@@ -1,6 +1,7 @@
-// TODO: this probably should be coming from scratch-l10n
-// Tracking in https://github.com/LLK/scratch-l10n/issues/32
-const rtlLocales = ['he'];
+/**
+ * @fileoverview
+ * Utility functions related to localization specific to the GUI
+ */
 
 const wideLocales = [
     'ab',
@@ -16,12 +17,17 @@ const wideLocales = [
     'vi'
 ];
 
+/**
+ * Identify the languages where translations are too long to fit in fixed width parts of the gui.
+ * @param {string} locale The current locale.
+ * @return {bool} true if translations in this language are too long
+ */
+
 const isWideLocale = locale => (
     wideLocales.indexOf(locale) !== -1
 );
 
 export {
-    rtlLocales,
     wideLocales,
     isWideLocale
 };

src/reducers/locales.js

@@ -2,7 +2,7 @@ import {addLocaleData} from 'react-intl';
 
 import {localeData} from 'scratch-l10n';
 import editorMessages from 'scratch-l10n/locales/editor-msgs';
-import {rtlLocales} from '../lib/locale-utils';
+import {isRtl} from 'scratch-l10n';
 
 addLocaleData(localeData);
 
@@ -21,7 +21,7 @@ const reducer = function (state, action) {
     switch (action.type) {
     case SELECT_LOCALE:
         return Object.assign({}, state, {
-            isRtl: rtlLocales.indexOf(action.locale) !== -1,
+            isRtl: isRtl(action.locale),
             locale: action.locale,
             messagesByLocale: state.messagesByLocale,
             messages: state.messagesByLocale[action.locale]
@@ -57,7 +57,7 @@ const initLocale = function (currentState, locale) {
             {},
             currentState,
             {
-                isRtl: rtlLocales.indexOf(locale) !== -1,
+                isRtl: isRtl(locale),
                 locale: locale,
                 messagesByLocale: currentState.messagesByLocale,
                 messages: currentState.messagesByLocale[locale]