feat: Add initial language support for English and Japanese

- Add translation framework for UI elements
- Implement language switching functionality
- Add English and Japanese translations for UI components
- Card names and effects translation to be implemented in future commits

1 files changed, 31 insertions, 0 deletions

diff --git a/src/language.js b/src/language.js
new file mode 100644
index 0000000..b4b9605
--- /dev/null
+++ b/src/language.js
@@ -0,0 +1,31 @@
+import { writable, derived } from "svelte/store";
+import translations from './translations.js';
+
+let defaultLanguage = 'chinese';
+let language = writable(defaultLanguage);
+let languageState = defaultLanguage;
+
+function setLanguage(newLanguage) {
+    localStorage.setItem('language', newLanguage);
+    languageState = newLanguage;
+    language.set(newLanguage);
+}
+
+function initLanguage() {
+    let cachedLanguage = localStorage.getItem('language');
+    if (cachedLanguage !== null) {
+        setLanguage(cachedLanguage);
+    }
+}
+
+const currentTranslations = derived(language, ($language) => {
+    return translations[$language] || translations.chinese;
+});
+
+export {
+    language,
+    languageState,
+    setLanguage,
+    initLanguage,
+    currentTranslations,
+};
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