Added locale name(ml) (#171)

I have no clue if what I did was correct. If it is not, please try to display the locale name. Thanks

src/services/i18n.service.ts

@@ -30,6 +30,7 @@ export class I18nService implements I18nServiceAbstraction {
         ['it', 'italiano'],
         ['ja', '日本語'],
         ['ko', '한국어'],
+        ['ml', 'മലയാളം'], 
         ['nb', 'norsk (bokmål)'],
         ['nl', 'Nederlands'],
         ['pl', 'polski'],