diff --git a/.cursor/rules/general-rules.mdc b/.cursor/rules/general-rules.mdc
index efe32cd30..f9f053759 100644
--- a/.cursor/rules/general-rules.mdc
+++ b/.cursor/rules/general-rules.mdc
@@ -11,7 +11,6 @@ alwaysApply: true
   - Read [project-design.mdc](mdc:.cursor/rules/project-design.mdc) to understand the codebase
   - Read [project-conventions.mdc](mdc:.cursor/rules/project-conventions.mdc) to understand _how_ to write code for the codebase
   - Read [ui-ux-design-guidelines.mdc](mdc:.cursor/rules/ui-ux-design-guidelines.mdc) to understand how to implement frontend code specifically
-- Ignore i18n methods and files. Hardcode strings in English for now to optimize speed of development.
 - ActiveRecord migrations must inherit from `ActiveRecord::Migration[7.2]`. Do **not** use version 8.0 yet.
 
 ## Prohibited actions
diff --git a/CLAUDE.md b/CLAUDE.md
index 8f0e2de7f..575ba82c5 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -56,8 +56,7 @@ Only proceed with pull request creation if ALL checks pass.
 - Use `Current.family` for the current family. Do NOT use `current_family`.
 
 ### Development Guidelines
-- Prior to generating any code, carefully read the project conventions and guidelines
-- Ignore i18n methods and files. Hardcode strings in English for now to optimize speed of development
+- Carefully read project conventions and guidelines before generating any code.
 - Do not run `rails server` in your responses
 - Do not run `touch tmp/restart.txt`
 - Do not run `rails credentials`
@@ -112,6 +111,15 @@ Sidekiq handles asynchronous tasks:
   - Always use functional tokens (e.g., `text-primary` not `text-white`)
   - Prefer semantic HTML elements over JS components
   - Use `icon` helper for icons, never `lucide_icon` directly
+- **i18n**: All user-facing strings must use localization (i18n). Update locale files for each new or changed element.
+
+### Internationalization (i18n) Guidelines
+- **Key Organization**: Use hierarchical keys by feature: `accounts.index.title`, `transactions.form.amount_label`
+- **Translation Helper**: Always use `t()` helper for user-facing strings
+- **Interpolation**: Use for dynamic content: `t("users.greeting", name: user.name)`
+- **Pluralization**: Use Rails pluralization: `t("transactions.count", count: @transactions.count)`
+- **Locale Files**: Update `config/locales/en.yml` for new strings
+- **Missing Translations**: Configure to raise errors in development for missing keys
 
 ### Multi-Currency Support
 - All monetary values stored in base currency (user's primary currency)
@@ -220,11 +228,36 @@ Sidekiq handles asynchronous tasks:
 ```erb
 <!-- GOOD: Declarative - HTML declares what happens -->
 <div data-controller="toggle">
-  <button data-action="click->toggle#toggle" data-toggle-target="button">Show</button>
-  <div data-toggle-target="content" class="hidden">Hello World!</div>
+  <button data-action="click->toggle#toggle" data-toggle-target="button">
+    <%= t("components.transaction_details.show_details") %>
+  </button>
+  <div data-toggle-target="content" class="hidden">
+    <p><%= t("components.transaction_details.amount_label") %>: <%= @transaction.amount %></p>
+    <p><%= t("components.transaction_details.date_label") %>: <%= @transaction.date %></p>
+    <p><%= t("components.transaction_details.category_label") %>: <%= @transaction.category.name %></p>
+  </div>
 </div>
 ```
 
+**Example locale file structure (config/locales/en.yml):**
+```yaml
+en:
+  components:
+    transaction_details:
+      show_details: "Show Details"
+      hide_details: "Hide Details"
+      amount_label: "Amount"
+      date_label: "Date"
+      category_label: "Category"
+```
+
+**i18n Best Practices:**
+- Organize keys by feature/component: `components.transaction_details.show_details`
+- Use descriptive key names that indicate purpose: `show_details` not `button`
+- Group related translations together in the same namespace
+- Use interpolation for dynamic content: `t("users.welcome", name: user.name)`
+- Always update locale files when adding new user-facing strings
+
 **Controller Best Practices:**
 - Keep controllers lightweight and simple (< 7 targets)
 - Use private methods and expose clear public API
diff --git a/app/views/pages/dashboard.html.erb b/app/views/pages/dashboard.html.erb
index 3951d6106..f67237d48 100644
--- a/app/views/pages/dashboard.html.erb
+++ b/app/views/pages/dashboard.html.erb
@@ -1,13 +1,17 @@
 <% content_for :page_header do %>
   <div class="space-y-1 mb-6 flex gap-4 justify-between items-center lg:items-start">
     <div class="space-y-1">
-      <h1 class="text-xl lg:text-3xl font-medium text-primary">Welcome back, <%= Current.user.first_name %></h1>
-      <p class="text-sm lg:text-base text-secondary">Here's what's happening with your finances</p>
+      <h1 class="text-xl lg:text-3xl font-medium text-primary">
+        <%= t("pages.dashboard.welcome", name: Current.user.first_name) %>
+      </h1>
+      <p class="text-sm lg:text-base text-secondary">
+        <%= t("pages.dashboard.subtitle") %>
+      </p>
     </div>
 
     <%= render DS::Link.new(
       icon: "plus",
-      text: "New",
+      text: t("pages.dashboard.new"),
       href: new_account_path,
       frame: :modal,
       class: "hidden lg:inline-flex"
diff --git a/app/views/pages/dashboard/_balance_sheet.html.erb b/app/views/pages/dashboard/_balance_sheet.html.erb
index 305733242..5273e5031 100644
--- a/app/views/pages/dashboard/_balance_sheet.html.erb
+++ b/app/views/pages/dashboard/_balance_sheet.html.erb
@@ -117,8 +117,12 @@
             icon: classification_group.icon,
           ) %>
 
-          <p class="text-primary text-sm font-medium mb-1 mt-4">No <%= classification_group.name %> yet</p>
-          <p class="text-secondary text-sm text-center"><%= "Add your #{classification_group.name} accounts to see a full breakdown" %></p>
+          <p class="text-primary text-sm font-medium mb-1 mt-4">
+            <%= t("pages.dashboard.balance_sheet.no_items", name: classification_group.name) %>
+          </p>
+          <p class="text-secondary text-sm text-center">
+            <%= t("pages.dashboard.balance_sheet.add_accounts", name: classification_group.name) %>
+          </p>
         </div>
       <% end %>
     </div>
diff --git a/app/views/pages/dashboard/_cashflow_sankey.html.erb b/app/views/pages/dashboard/_cashflow_sankey.html.erb
index ec03f8418..1f9b30053 100644
--- a/app/views/pages/dashboard/_cashflow_sankey.html.erb
+++ b/app/views/pages/dashboard/_cashflow_sankey.html.erb
@@ -2,7 +2,7 @@
 <div id="cashflow-sankey-chart">
   <div class="flex justify-between items-center gap-4 px-4 mb-4">
     <h2 class="text-lg font-medium inline-flex items-center gap-1.5">
-      Cashflow
+      <%= t("pages.dashboard.cashflow_sankey.title") %>
     </h2>
 
     <%= form_with url: root_path, method: :get, data: { controller: "auto-submit-form", turbo_frame: "cashflow_sankey_section" } do |form| %>
@@ -30,10 +30,10 @@
           icon: "activity" # cashflow placeholder icon
         ) %>
 
-        <p class="text-sm font-medium text-primary">No cash flow data for this time period</p>
-        <p class="text-secondary text-sm">Add transactions to display cash flow data or expand the time period</p>
+        <p class="text-sm font-medium text-primary"><%= t("pages.dashboard.cashflow_sankey.no_data_title") %></p>
+        <p class="text-secondary text-sm"><%= t("pages.dashboard.cashflow_sankey.no_data_description") %></p>
         <%= render DS::Link.new(
-          text: "Add transaction",
+          text: t("pages.dashboard.cashflow_sankey.add_transaction"),
           icon: "plus",
           href: new_transaction_path,
           frame: :modal
diff --git a/app/views/pages/dashboard/_no_accounts_graph_placeholder.html.erb b/app/views/pages/dashboard/_no_accounts_graph_placeholder.html.erb
index 5b0909c1f..b8cca831b 100644
--- a/app/views/pages/dashboard/_no_accounts_graph_placeholder.html.erb
+++ b/app/views/pages/dashboard/_no_accounts_graph_placeholder.html.erb
@@ -5,10 +5,10 @@
       icon: "layers",
     ) %>
 
-    <p class="text-sm font-medium text-primary">No accounts yet</p>
-    <p class="text-secondary text-sm">Add accounts to display net worth data</p>
+    <p class="text-sm font-medium text-primary"><%= t("pages.dashboard.no_accounts.title") %></p>
+    <p class="text-secondary text-sm"><%= t("pages.dashboard.no_accounts.description") %></p>
     <%= render DS::Link.new(
-      text: "Add account",
+      text: t("pages.dashboard.no_accounts.add_account"),
       icon: "plus",
       href: new_account_path,
       frame: :modal
diff --git a/app/views/pages/dashboard/_outflows_donut.html.erb b/app/views/pages/dashboard/_outflows_donut.html.erb
index e89f4d4fe..cefd472f7 100644
--- a/app/views/pages/dashboard/_outflows_donut.html.erb
+++ b/app/views/pages/dashboard/_outflows_donut.html.erb
@@ -2,7 +2,7 @@
 <div id="outflows-donut-section">
   <div class="flex justify-between items-center gap-4 px-4 mb-4">
     <h2 class="text-lg font-medium inline-flex items-center gap-1.5">
-      Outflows
+      <%= t("pages.dashboard.outflows_donut.title") %>
     </h2>
 
     <%= form_with url: root_path, method: :get, data: { controller: "auto-submit-form", turbo_frame: "outflows_donut_section" } do |form| %>
@@ -33,7 +33,7 @@
           <div data-donut-chart-target="contentContainer" class="flex justify-center items-center h-full">
             <div data-donut-chart-target="defaultContent" class="flex flex-col items-center">
               <div class="text-secondary text-sm mb-2">
-                <span>Total Outflows</span>
+                <span><%= t("pages.dashboard.outflows_donut.total_outflows") %></span>
               </div>
 
               <div class="text-3xl font-medium text-primary">
diff --git a/config/locales/views/pages/ca.yml b/config/locales/views/pages/ca.yml
index 30081e7b0..568c59920 100644
--- a/config/locales/views/pages/ca.yml
+++ b/config/locales/views/pages/ca.yml
@@ -2,13 +2,30 @@
 ca:
   pages:
     changelog:
-      title: Novetats
+      title: "Novetats"
     dashboard:
+      welcome: "Benvingut/da de nou, %{name}"
+      subtitle: "Això és el que està passant amb les teves finances"
+      new: "Nou"
       net_worth_chart:
-        data_not_available: No hi ha dades disponibles per al període seleccionat
-        title: Patrimoni net
+        data_not_available: "Dades no disponibles per al període seleccionat"
+        title: "Patrimoni net"
       no_account_empty_state:
-        new_account: Nou compte
-        no_account_subtitle: Com que no s'ha afegit cap compte, no hi ha dades per mostrar. Afegeix els teus primers comptes per començar a veure dades al tauler.
-        no_account_title: Encara no hi ha cap compte
-
+        new_account: "Nou compte"
+        no_account_subtitle: "Com que no s'ha afegit cap compte, no hi ha dades per mostrar. Afegeix els teus primers comptes per començar a veure dades al tauler."
+        no_account_title: "Encara no hi ha comptes"
+      balance_sheet:
+        no_items: "Encara no hi ha %{name}"
+        add_accounts: "Afegeix els teus comptes de %{name} per veure'n el detall complet"
+      cashflow_sankey:
+        title: "Flux de caixa"
+        no_data_title: "No hi ha dades de flux de caixa per a aquest període de temps"
+        no_data_description: "Afegeix transaccions per mostrar dades de flux de caixa o amplia el període de temps"
+        add_transaction: "Afegeix una transacció"
+      no_accounts:
+        title: "Encara no hi ha comptes"
+        description: "Afegeix comptes per mostrar dades de patrimoni net"
+        add_account: "Afegeix un compte"
+      outflows_donut:
+        title: "Sortides"
+        total_outflows: "Total sortides"
diff --git a/config/locales/views/pages/en.yml b/config/locales/views/pages/en.yml
index 1ee15ca35..f33a3e00a 100644
--- a/config/locales/views/pages/en.yml
+++ b/config/locales/views/pages/en.yml
@@ -4,11 +4,28 @@ en:
     changelog:
       title: What's new
     dashboard:
+      welcome: "Welcome back, %{name}"
+      subtitle: "Here's what's happening with your finances"
+      new: "New"
       net_worth_chart:
         data_not_available: Data not available for the selected period
         title: Net Worth
       no_account_empty_state:
         new_account: New account
-        no_account_subtitle: Since no accounts have been added, there's no data to
-          display. Add your first accounts to start viewing dashboard data.
+        no_account_subtitle: Since no accounts have been added, there's no data to display. Add your first accounts to start viewing dashboard data.
         no_account_title: No accounts yet
+      balance_sheet:
+        no_items: "No %{name} yet"
+        add_accounts: "Add your %{name} accounts to see a full breakdown"
+      cashflow_sankey:
+        title: "Cashflow"
+        no_data_title: "No cash flow data for this time period"
+        no_data_description: "Add transactions to display cash flow data or expand the time period"
+        add_transaction: "Add transaction"
+      no_accounts:
+        title: "No accounts yet"
+        description: "Add accounts to display net worth data"
+        add_account: "Add account"
+      outflows_donut:
+        title: "Outflows"
+        total_outflows: "Total Outflows"