[Vuejs]-How to set dynamic value in variable or connect two variable Vue

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Ok I have spend 2 work days for find answer but nothing Now I declare variable not in data then I change variable and refresh DOM but variable "decor" not changing

var ecoveneer_magma_oak= 'Дуб Бордо'
      export default {
        data() {
    doors: [
        {
          image:"1.jpg",
          model:"018 BG",
          decor: ecoveneer_magma_oak,
          id:"1"
        }],
    methods: {
      changeLange(lang){    
          if(lang==='RU'){
             this.renderComponent = false;
            this.$nextTick(() => {
              // Add the component back in
              this.renderComponent = true;
            });
          
          ecoveneer_magma_oak="Ecoveneer Magma Oak"
   }
 }

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