Random changes for many files.

Signed-off-by: Pavel Kirilin <win10@list.ru>

store/README.md

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+# STORE
+
+**This directory is not required, you can delete it if you don't want to use it.**
+
+This directory contains your Vuex Store files.
+Vuex Store option is implemented in the Nuxt.js framework.
+
+Creating a file in this directory automatically activates the option in the framework.
+
+More information about the usage of this directory in [the documentation](https://nuxtjs.org/guide/vuex-store).

store/index.ts

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+interface State{
+  lang: String
+}
+
+export const state = () => {
+  return {
+    lang: "ru"
+  }
+}
+
+export const mutations = {
+  set_lang (state: State, value: String) {
+    state.lang = value
+  },
+}