Use i18n for AI cache reset strings

Extract hardcoded strings to locale file for proper internationalization.

app/controllers/rules_controller.rb

@@ -130,7 +130,7 @@ class RulesController < ApplicationController
 
   def clear_ai_cache
     ClearAiCacheJob.perform_later(Current.family)
-    redirect_to rules_path, notice: "AI cache is being cleared. This may take a few moments."
+    redirect_to rules_path, notice: t("rules.clear_ai_cache.success")
   end
 
   private

app/views/rules/index.html.erb

@@ -5,14 +5,14 @@
       <%= render DS::Menu.new do |menu| %>
         <% menu.with_item(
           variant: "button",
-          text: "Reset AI cache",
+          text: t("rules.clear_ai_cache.button"),
           href: clear_ai_cache_rules_path,
           icon: "refresh-cw",
           method: :post,
           confirm: CustomConfirm.new(
-            title: "Reset AI cache?",
-            body: "Are you sure you want to reset the AI cache? This will allow AI rules to re-process all transactions. This may incur additional API costs.",
-            btn_text: "Reset Cache"
+            title: t("rules.clear_ai_cache.confirm_title"),
+            body: t("rules.clear_ai_cache.confirm_body"),
+            btn_text: t("rules.clear_ai_cache.confirm_button")
           )) %>
         <% menu.with_item(
           variant: "button",

config/locales/views/rules/en.yml

@@ -37,3 +37,9 @@ en:
         pending: Pending
         success: Success
         failed: Failed
+    clear_ai_cache:
+      button: Reset AI cache
+      confirm_title: Reset AI cache?
+      confirm_body: Are you sure you want to reset the AI cache? This will allow AI rules to re-process all transactions. This may incur additional API costs.
+      confirm_button: Reset Cache
+      success: AI cache is being cleared. This may take a few moments.