diff --git a/locales/en/main.ftl b/locales/en/main.ftl
index fdf0516..ef3b336 100644
--- a/locales/en/main.ftl
+++ b/locales/en/main.ftl
@@ -1 +1,6 @@
 not-found = We couldn't find that page.
+title = Hypergeometric Distribution Calculator
+population = Population Size
+successes = Successes in Population
+sample = Sample Size
+sample_successes = Successes in Sample
diff --git a/locales/es/main.ftl b/locales/es/main.ftl
index 3eeeb18..ac1aaa8 100644
--- a/locales/es/main.ftl
+++ b/locales/es/main.ftl
@@ -1 +1,6 @@
 not-found = No pudimos encontrar esta página.
+title = Calculadora Distribución Hipergeométrica
+population = Tamaño población
+successes =  Éxitos en la población
+sample = Tamaño de la muestra
+sample_successes = Éxitos en la muestra
diff --git a/public/styles.scss b/public/styles.scss
index 7fd0794..56b7814 100644
--- a/public/styles.scss
+++ b/public/styles.scss
@@ -32,6 +32,11 @@ h6 {
   padding: 2rem;
 }
 
+h1.title {
+  width: 80vw;
+  max-inline-size: 80vw;
+}
+
 p {
   margin: var(--size-6);
 }
@@ -59,7 +64,7 @@ form input {
 
 form > div.results {
   display: grid;
-  grid-template-columns: 1fr 6em 6em 1fr;
+  grid-template-columns: 1fr 8em 5em 1fr;
   min-width: 20em;
   max-width: 30em;
   width: 30vw;
diff --git a/src/components/calculator.rs b/src/components/calculator.rs
index cf62eab..209d77d 100644
--- a/src/components/calculator.rs
+++ b/src/components/calculator.rs
@@ -1,9 +1,10 @@
 //! Hypergeometric Distribution Calculator
 use leptos::html::ElementChild;
 use leptos::prelude::{
-    signal, ClassAttribute, Get, GlobalAttributes, OnTargetAttribute, PropAttribute, Set,
+    ClassAttribute, Get, GlobalAttributes, OnTargetAttribute, PropAttribute, Set, signal,
 };
-use leptos::{component, view, IntoView};
+use leptos::{IntoView, component, view};
+use leptos_fluent::move_tr;
 
 use crate::calc::hyper_geometric;
 
@@ -26,7 +27,7 @@ pub fn Calculator() -> impl IntoView {
     view! {
         <form>
             <p>
-                <label for="population">Population Size</label>
+                <label for="population">{move_tr!("population")}</label>
                 <input
                     id="population"
                     type="number"
@@ -38,7 +39,7 @@ pub fn Calculator() -> impl IntoView {
                 />
             </p>
             <p>
-                <label for="successes">Successes in Population</label>
+                <label for="successes">{move_tr!("successes")}</label>
                 <input
                     id="successes"
                     type="number"
@@ -51,7 +52,7 @@ pub fn Calculator() -> impl IntoView {
                 />
             </p>
             <p>
-                <label for="sample">Sample Size</label>
+                <label for="sample">{move_tr!("sample")}</label>
                 <input
                     id="sample"
                     type="number"
@@ -64,7 +65,7 @@ pub fn Calculator() -> impl IntoView {
                 />
             </p>
             <p>
-                <label for="sample_successes">Successes in Sample</label>
+                <label for="sample_successes">{move_tr!("sample_successes")}</label>
                 <input
                     id="sample_successes"
                     type="number"
diff --git a/src/components/localization.rs b/src/components/localization.rs
new file mode 100644
index 0000000..b09fed9
--- /dev/null
+++ b/src/components/localization.rs
@@ -0,0 +1,55 @@
+//! Localization selector
+
+use fluent_templates::static_loader;
+use leptos::html::ElementChild;
+use leptos::prelude::{Children, GlobalAttributes, OnAttribute, PropAttribute, Set};
+use leptos::{IntoView, component, view};
+use leptos_fluent::{Language, expect_i18n, leptos_fluent};
+
+static_loader! {
+    pub static TRANSLATIONS = {
+        locales: "./locales",
+        fallback_language: "en",
+    };
+}
+
+/// This component provide localization context to every children component.
+#[component]
+pub fn I18n(children: Children) -> impl IntoView {
+    leptos_fluent! {
+        children: children(),
+        translations: [TRANSLATIONS],
+        locales: "./locales",
+        check_translations: "./src/**/*.rs",
+    }
+}
+#[component]
+pub fn LanguageSelector() -> impl IntoView {
+    // Use `expect_i18n()` to get the current i18n context:
+    let i18n = expect_i18n();
+
+    view! {
+        <label for="language">"A/文:"</label>
+        <select id="language">
+            {move || {
+                i18n.languages.iter().map(|lang| render_language(lang)).collect::<Vec<_>>()
+            }}
+        </select>
+    }
+}
+
+fn render_language(lang: &'static Language) -> impl IntoView {
+    // Passed as atrribute, `Language` is converted to their code,
+    // so `<input id=lang` becomes `<input id=lang.id.to_string()`
+    let i18n = expect_i18n();
+    view! {
+        <option
+                id=lang
+                value=lang
+                prop:selected=lang.is_active()
+                on:click=move |_| i18n.language.set(lang)
+            >
+            {lang.name}
+        </option>
+    }
+}
diff --git a/src/components/mod.rs b/src/components/mod.rs
index 09bb58d..eb8d043 100644
--- a/src/components/mod.rs
+++ b/src/components/mod.rs
@@ -1 +1,2 @@
 pub mod calculator;
+pub mod localization;
diff --git a/src/lib.rs b/src/lib.rs
index 88c4bd7..214db8d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,5 @@
-use fluent_templates::static_loader;
 use leptos::prelude::{AddAnyAttr, IntoAttribute};
-use leptos::{component, view, IntoView};
+use leptos::{IntoView, component, view};
 use leptos_meta::*;
 use leptos_router::{components::*, path};
 
@@ -12,14 +11,6 @@ mod pages;
 // Top-Level pages
 use crate::pages::home::Home;
 
-// Localization
-static_loader! {
-    pub static TRANSLATIONS = {
-        locales: "./locales",
-        fallback_language: "en",
-    };
-}
-
 /// An app router which renders the homepage and handles 404's
 #[component]
 pub fn App() -> impl IntoView {
@@ -30,7 +21,7 @@ pub fn App() -> impl IntoView {
         <Html attr:lang="en" attr:dir="ltr" attr:data-theme="light" />
 
         // sets the document title
-        <Title text="Welcome to Leptos CSR" />
+        <Title text="Hypergeometric Calculator" />
 
         // injects metadata in the <head> of the page
         <Meta charset="UTF-8" />
diff --git a/src/pages/home.rs b/src/pages/home.rs
index cfdbb49..02297ab 100644
--- a/src/pages/home.rs
+++ b/src/pages/home.rs
@@ -2,9 +2,11 @@ use leptos::attr::global::ClassAttribute;
 use leptos::error::ErrorBoundary;
 use leptos::html::ElementChild;
 use leptos::prelude::{CollectView, Get};
-use leptos::{component, view, IntoView};
+use leptos::{IntoView, component, view};
+use leptos_fluent::move_tr;
 
 use crate::components::calculator::Calculator;
+use crate::components::localization::{I18n, LanguageSelector};
 
 /// Default Home Page
 #[component]
@@ -28,13 +30,21 @@ pub fn Home() -> impl IntoView {
                 </ul>
             }
         }>
-            <div class="container">
-                <h1>"Hypergeometric Distribution Calculator"</h1>
-
-                <div class="calculator">
+            <I18n>
+                <header>
+                    <LanguageSelector />
+                </header>
+                <div class="container">
+                    <Title />
                     <Calculator />
                 </div>
-            </div>
+            </I18n>
         </ErrorBoundary>
     }
 }
+
+/// Title
+#[component]
+pub fn Title() -> impl IntoView {
+    view! {<h1 class="title">{move_tr!("title")}</h1>}
+}
diff --git a/src/pages/not_found.rs b/src/pages/not_found.rs
index 16e6225..a9075d6 100644
--- a/src/pages/not_found.rs
+++ b/src/pages/not_found.rs
@@ -1,8 +1,15 @@
 use leptos::html::ElementChild;
-use leptos::{component, view, IntoView};
+use leptos::{IntoView, component, view};
+use leptos_fluent::move_tr;
+
+use crate::components::localization::I18n;
 
 /// 404 Not Found Page
 #[component]
 pub fn NotFound() -> impl IntoView {
-    view! { <h1>"We couldn't find that page."</h1> }
+    view! {
+        <I18n>
+            <h1>{move_tr!("not-found")}</h1>
+        </I18n>
+    }
 }