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

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/src/components/UsageInstructions.tsx b/src/components/UsageInstructions.tsx
index 0c27517..6d32506 100644
--- a/src/components/UsageInstructions.tsx
+++ b/src/components/UsageInstructions.tsx
@@ -1,5 +1,6 @@
 import { PanelSectionRow } from "@decky/ui";
 import { ConfigurationData } from "../config/configSchema";
+import t from '../i18n/i18n';
 
 interface UsageInstructionsProps {
   config: ConfigurationData;
@@ -20,7 +21,7 @@ export function UsageInstructions({ config: _config }: UsageInstructionsProps) {
             color: "white"
           }}
         >
-          Usage Instructions
+          {t('USAGE_TITLE', 'Usage Instructions')}
         </div>
       </PanelSectionRow>
 
@@ -33,7 +34,7 @@ export function UsageInstructions({ config: _config }: UsageInstructionsProps) {
             whiteSpace: "pre-wrap"
           }}
         >
-          Click "Copy Launch Option" button, then paste it into your Steam game's launch options to enable frame generation.
+          {t('USAGE_DESC', 'Click "Copy Launch Option" button, then paste it into your Steam game\'s launch options to enable frame generation.')}
         </div>
       </PanelSectionRow>
 
@@ -65,7 +66,7 @@ export function UsageInstructions({ config: _config }: UsageInstructionsProps) {
             marginTop: "8px"
           }}
         >
-The configuration is stored in ~/.config/lsfg-vk/conf.toml and hot-reloads while games are running.
+          {t('USAGE_CONFIG_NOTE', 'The configuration is stored in ~/.config/lsfg-vk/conf.toml and hot-reloads while games are running.')}
         </div>
       </PanelSectionRow>
     </>