docs(README): improved docs

README.md

@@ -139,7 +139,9 @@ translate.setTranslation('en', {
 
 You can use the `TranslateService` to get new translations like this:
 ```ts
-translate.getTranslation(userLang);
+translate.get('SOME_KEY').subscribe((res: string) => {
+    // do something with res
+});
 ```
 
 Or use the `TranslatePipe` in any template:
@@ -166,7 +168,7 @@ Or use the `TranslatePipe` in any template:
 - `setDefaultLang(lang: string)`: Sets the default language to use as a fallback
 - `use(lang: string): Observable<any>`: Changes the lang currently used
 - `getTranslation(lang: string): Observable<any>`: Gets an object of translations for a given language with the current loader
-- `setTranslation(lang: string, translations: Object)`: Manually sets an object of translations for a given language
+- `setTranslation(lang: string, translations: Object, shouldMerge: boolean = false)`: Manually sets an object of translations for a given language, set `shouldMerge` to true if you want to append the translations instead of replacing them
 - `getLangs()`: Returns an array of currently available langs
 - `get(key: string|Array<string>, interpolateParams?: Object): Observable<string|Object>`: Gets the translated value of a key (or an array of keys)
 - `instant(key: string|Array<string>, interpolateParams?: Object): string|Object`: Gets the instant translated value of a key (or an array of keys). /!\ This method is **synchronous** and the default file loader is asynchronous. You are responsible for knowing when your translations have been loaded and it is safe to use this method. If you are not sure then you should use the `get` method instead.

src/translate.service.ts

@@ -135,6 +135,7 @@ export class TranslateService {
      * Manually sets an object of translations for a given language
      * @param lang
      * @param translations
+     * @param shouldMerge
      */
     public setTranslation(lang: string, translations: Object, shouldMerge: boolean = false): void {
         if (shouldMerge && this.translations[lang]) {