Client - add dropdown to select language

fittrackee_client/src/store/index.ts

@@ -1,8 +1,14 @@
 import { createStore } from 'vuex'
 
 export default createStore({
-  state: {},
-  mutations: {},
+  state: {
+    language: 'en',
+  },
+  mutations: {
+    setLanguage(state, language: string) {
+      state.language = language
+    },
+  },
   actions: {},
   modules: {},
 })