[Code scan] Restore the saved language from storage instead of overwriting it

[njzjz]

This issue was found during a Codex global code scan of the repository.

Baseline commit: e3c5b38

Problem

The mounted hook calls the storage setter when it appears to intend to read the saved language.

Code references:

dpgui/src/App.vue

Lines 101 to 103 in e3c5b38

	mounted: function () {
	this.$i18n.locale =
	this.$storage.setStorageSync("lang") || this.$i18n.locale;

dpgui/src/App.vue

Lines 208 to 211 in e3c5b38

	updatelang: function (value) {
	this.$i18n.locale = value;
	this.$storage.setStorageSync("lang", value);
	this.update_navi();

Relevant snippet:

this.$i18n.locale =
  this.$storage.setStorageSync("lang") || this.$i18n.locale;

Impact

A previously selected language is not restored on reload. Depending on the storage helper behavior, the call may also overwrite the saved lang value with an empty value.

Suggested fix

Use getStorageSync("lang") in mounted() and keep setStorageSync("lang", value) only in the language update handler.