Apply i18n to all UI components with ko/ja translations

- Add src/i18n/i18n.ts translation engine (ported from SimpleDeckyTDP)
- Add defaults/i18n/{ko,ja,template}.json with 80 translation keys
- Add defaults/i18n/language_metadata.json and steam_language_map.json
- Add scripts/build_i18n_json.sh to generate languages.json
- Apply t() to all 10 components: Content, ConfigurationSection,
  FlatpaksModal, FpsMultiplierControl, InstallationButton, NerdStuffModal,
  ProfileManagement, SmartClipboardButton, FgmodClipboardButton, UsageInstructions

1 files changed, 2 insertions, 1 deletions

diff --git a/src/components/FpsMultiplierControl.tsx b/src/components/FpsMultiplierControl.tsx
index 5ac31bb..206643e 100644
--- a/src/components/FpsMultiplierControl.tsx
+++ b/src/components/FpsMultiplierControl.tsx
@@ -1,6 +1,7 @@
 import { PanelSectionRow, DialogButton, Focusable } from "@decky/ui";
 import { ConfigurationData } from "../config/configSchema";
 import { MULTIPLIER } from "../config/generatedConfigSchema";
+import t from '../i18n/i18n';
 
 interface FpsMultiplierControlProps {
   config: ConfigurationData;
@@ -49,7 +50,7 @@ export function FpsMultiplierControl({
             textAlign: "center"
           }}
         >
-          {config.multiplier < 2 ? "OFF" : `${config.multiplier}X`}
+          {config.multiplier < 2 ? t('MULTIPLIER_OFF', 'OFF') : `${config.multiplier}X`}
         </div>
         <DialogButton
           style={{