add language toggle

src/lib/contexts/languageContext.js

@@ -0,0 +1,18 @@
+import { setContext, getContext } from 'svelte';
+import { writable } from 'svelte/store';
+
+const LANGUAGE_CONTEXT_KEY = Symbol('language');
+
+export function createLanguageContext() {
+	const showLatin = writable(true); // true = bilingual, false = monolingual
+
+	setContext(LANGUAGE_CONTEXT_KEY, {
+		showLatin
+	});
+
+	return { showLatin };
+}
+
+export function getLanguageContext() {
+	return getContext(LANGUAGE_CONTEXT_KEY);
+}