add study flow endpoints

backend/src/localization/mod.rs

@@ -0,0 +1,51 @@
+use std::collections::HashMap;
+
+use serde::{Deserialize, Serialize};
+use serde_json as json;
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct LocalizationBundleSnapshot {
+    pub locale_code: String,
+    pub values: HashMap<String, String>,
+}
+
+#[derive(Clone)]
+pub struct LocalizationStore {
+    bundles: HashMap<String, LocalizationBundleSnapshot>,
+}
+
+impl LocalizationStore {
+    pub fn new() -> Self {
+        let mut bundles = HashMap::new();
+        bundles.insert(
+            "en".to_string(),
+            load_bundle(
+                "en",
+                include_str!("../../../contracts/localization/en.json"),
+            ),
+        );
+        bundles.insert(
+            "sv".to_string(),
+            load_bundle(
+                "sv",
+                include_str!("../../../contracts/localization/sv.json"),
+            ),
+        );
+        Self { bundles }
+    }
+
+    pub fn bundle(&self, locale_code: &str) -> Option<LocalizationBundleSnapshot> {
+        let Some(bundle) = self.bundles.get(locale_code) else {
+            return None;
+        };
+        Some(bundle.clone())
+    }
+}
+
+fn load_bundle(locale_code: &str, raw: &str) -> LocalizationBundleSnapshot {
+    let values: HashMap<String, String> = json::from_str(raw).expect("valid localization bundle");
+    LocalizationBundleSnapshot {
+        locale_code: locale_code.to_string(),
+        values,
+    }
+}