diff --git a/index.html b/index.html
index a17d0669..53ea15ba 100644
--- a/index.html
+++ b/index.html
@@ -38,12 +38,10 @@
           <div id="lngList" class="dropdown-menu"></div>
         </li>
         <li class="nav-item dropdown">
-          <a class="nav-link dropdown-toggle" href="" role="button" data-toggle="dropdown">
-            Theme
-          </a>
+          <a class="nav-link dropdown-toggle" href="" role="button" data-toggle="dropdown" data-i18n="theme"></a>
           <div class="dropdown-menu">
-            <a class="dropdown-item" onclick="changeTheme('light')">Light</a>
-            <a class="dropdown-item" onclick="changeTheme('dark')">Dark</a>
+            <a class="dropdown-item" onclick="changeTheme('light')" data-i18n="theme.light"></a>
+            <a class="dropdown-item" onclick="changeTheme('dark')" data-i18n="theme.dark"></a>
           </div>
         </li>
       </ul>
diff --git a/locales/en.json b/locales/en.json
index 73782d76..1af159bb 100644
--- a/locales/en.json
+++ b/locales/en.json
@@ -322,6 +322,9 @@
     "tabs": "Tabs",
     "term_add": "Add Term",
     "term_remove": "Remove Term",
+    "theme": "Theme",
+    "theme.light": "Light",
+    "theme.dark": "Dark",
     "title.loot-table": "Loot Table Generator",
     "title.predicate": "Predicate Generator",
     "true": "True",