feat(TranslateService): Added support for Language Culture Name

Fixes #293

README.md

@@ -220,6 +220,7 @@ In the html page:
 - `reloadLang(lang: string): Observable<string|Object>`: Calls resetLang and retrieves the translations object for the current loader
 - `resetLang(lang: string)`: Removes the current translations for this lang. /!\ You will have to call `use`, `reloadLang` or `getTranslation` again to be able to get translations
 - `getBrowserLang(): string | undefined`: Returns the current browser lang if available, or undefined otherwise 
+- `getBrowserCultureLang(): string | undefined`: Returns the current browser culture language name (e.g. "de-DE" if available, or undefined otherwise 
 
 #### Write & use your own loader
 If you want to write your own loader, you need to create a class that implements `TranslateLoader`.

src/translate.service.ts

@@ -361,6 +361,11 @@ export class TranslateService {
         this.translations[lang] = undefined;
     }
 
+    /**
+     * Returns the language code name from the browser, e.g. "de"
+     *
+     * @returns string
+     */
     public getBrowserLang(): string {
         if(typeof window === 'undefined' || typeof window.navigator === 'undefined') {
             return undefined;
@@ -379,4 +384,20 @@ export class TranslateService {
 
         return browserLang;
     }
+
+    /**
+     * Returns the culture language code name from the browser, e.g. "de-DE"
+     *
+     * @returns string
+     */
+    public getBrowserCultureLang(): string {
+        if (typeof window === 'undefined' || typeof window.navigator === 'undefined') {
+            return undefined;
+        }
+
+        let browserCultureLang: any = window.navigator.languages ? window.navigator.languages[0] : null;
+        browserCultureLang = browserCultureLang || window.navigator.language || window.navigator.browserLanguage || window.navigator.userLanguage;
+
+        return browserCultureLang;
+    }
 }

tests/translate.service.spec.ts

@@ -294,6 +294,12 @@ describe('TranslateService', () => {
         expect(browserLang).toBeDefined();
         expect(typeof browserLang === 'string').toBeTruthy();
     });
+
+    it('should be able to get the browserCultureLang', () => {
+        let browserCultureLand = translate.getBrowserCultureLang();
+        expect(browserCultureLand).toBeDefined();
+        expect(typeof browserCultureLand === 'string').toBeTruthy();
+    });
 });
 
 describe('MissingTranslationHandler', () => {