fix(core): language consumption from locale in payment and payout links (#7993)

Co-authored-by: hyperswitch-bot[bot] <148525504+hyperswitch-bot[bot]@users.noreply.github.com>

crates/router/src/core/payment_link/locale.js

@@ -619,8 +619,25 @@ const locales = {
     },
   };
 
-  function getTranslations(locale_str) {
-    var fallback_locale = 'en';
-    var locale = locale_str.toLowerCase().replace(/-/g, "_") || fallback_locale; // defaults if locale is not present in payment details.
-    return locales[locale] || locales['en']; // defaults if locale is not implemented in locales.
-  }
+function getLanguage(localeStr) {
+  var fallback_locale = 'en';
+  var primaryLocale = (localeStr.toLowerCase() || fallback_locale).split(',')[0].trim();
+  
+  // Split into language and country parts
+  var parts = primaryLocale.split('-');
+  var language = parts[0];
+  var country = parts.length > 1 ? parts[1] : null;
+
+  var key = `${language}_${country}`;
+  switch (key) {
+    case 'en_gb': return 'en_gb';
+    case 'fr_be': return 'fr_be';
+    default: return language;
+  }
+}
+
+function getTranslations(localeStr) {
+  var fallback_locale = 'en';
+  var language = getLanguage(localeStr);
+  return locales[language] || locales[fallback_locale];
+}

crates/router/src/services/api/generic_link_response/context.rs

@@ -1,7 +1,29 @@
+use common_utils::consts::DEFAULT_LOCALE;
 use rust_i18n::t;
 use tera::Context;
 
+fn get_language(locale_str: &str) -> String {
+    let lowercase_str = locale_str.to_lowercase();
+    let primary_locale = lowercase_str.split(',').next().unwrap_or("").trim();
+
+    if primary_locale.is_empty() {
+        return DEFAULT_LOCALE.to_string();
+    }
+
+    let parts = primary_locale.split('-').collect::<Vec<&str>>();
+    let language = *parts.first().unwrap_or(&DEFAULT_LOCALE);
+    let country = parts.get(1).copied();
+
+    match (language, country) {
+        ("en", Some("gb")) => "en_gb".to_string(),
+        ("fr", Some("be")) => "fr_be".to_string(),
+        (lang, _) => lang.to_string(),
+    }
+}
+
 pub fn insert_locales_in_context_for_payout_link(context: &mut Context, locale: &str) {
+    let language = get_language(locale);
+    let locale = language.as_str();
     let i18n_payout_link_title = t!("payout_link.initiate.title", locale = locale);
     let i18n_january = t!("months.january", locale = locale);
     let i18n_february = t!("months.february", locale = locale);
@@ -38,6 +60,8 @@ pub fn insert_locales_in_context_for_payout_link(context: &mut Context, locale:
 }
 
 pub fn insert_locales_in_context_for_payout_link_status(context: &mut Context, locale: &str) {
+    let language = get_language(locale);
+    let locale = language.as_str();
     let i18n_payout_link_status_title = t!("payout_link.status.title", locale = locale);
     let i18n_success_text = t!("payout_link.status.text.success", locale = locale);
     let i18n_success_message = t!("payout_link.status.message.success", locale = locale);