feat:#60 added switch button (not working)

frontend/src/components/LocaleSwitcher.vue

@@ -0,0 +1,39 @@
+<script lang="ts" setup>
+import i18n, { supportedLocales } from "../i18n";
+import { Ref, ref } from "vue";
+import router from "../router";
+import { useI18n } from "vue-i18n";
+
+const locales = ref(
+  Object.keys(supportedLocales).map((code) => ({
+    code,
+    name: supportedLocales[code].name,
+  })),
+);
+
+// selectedLocal is the string of the selected locale from i18n matched with the locales array
+const selectedLocale: Ref<any> = ref();
+
+const i18n1 = (i18n.vueI18n);
+
+function onLocaleChange() {
+  const newLocale: string = selectedLocale.value.code;
+
+  // If the selected locale is the same as the
+  // active one, do nothing
+  if (newLocale === i18n.vueI18n.global.locale) {
+    return;
+  }
+  i18n1.global.locale = newLocale;
+  router.push(`/${newLocale}`);
+}
+</script>
+<template>
+  <Dropdown
+    :options="locales"
+    optionLabel="name"
+    v-model="selectedLocale"
+    @change="onLocaleChange"
+  >
+  </Dropdown>
+</template>