Add localization support (#333)

* Add updated i18n config and en locale

src/renderer/utils/index.ts

@@ -7,3 +7,4 @@ export * from './get-header-color';
 export * from './parse-search-params';
 export * from './format-duration-string';
 export * from './rgb-to-rgba';
+export * from './sentence-case';

src/renderer/utils/sentence-case.ts

@@ -0,0 +1,3 @@
+export const sentenceCase = (string: string) => {
+    return string.charAt(0).toUpperCase() + string.slice(1);
+};