i18n(panel): translate Copy/Cancel buttons, Stream/Sniffing tabs, and All-Inbounds filenames

- TextModal: route the Copy button label and the post-copy toast
  through t('copy')/t('copied') instead of hardcoded English.
- PromptModal: route cancelText through t('cancel') and default okText
  through t('confirm') so the import-inbound prompt stops showing
  "Cancel" in non-English UI.
- InboundsPage: pass the All-Inbounds and All-Inbounds-Subs download
  filenames through t(...) so each locale can localize them.
- en-US.json: add pages.inbounds.exportAllLinksFileName and
  pages.inbounds.exportAllSubsFileName.
- All 12 non-English locales: translate streamTab and sniffingTab
  (previously left as literal English) and add the two new filename
  keys with appropriate translations.

All 13 locale files now have 1541 lines.

web/translation/zh-TW.json

@@ -322,6 +322,8 @@
       "exportSubsTitle": "匯出訂閱連結",
       "exportAllLinksTitle": "匯出所有入站連結",
       "exportAllSubsTitle": "匯出所有訂閱連結",
+      "exportAllLinksFileName": "所有入站",
+      "exportAllSubsFileName": "所有入站-Subs",
       "inboundJsonTitle": "入站 JSON",
       "deleteClient": "刪除客戶端",
       "deleteClientContent": "確定要刪除客戶端嗎？",
@@ -368,9 +370,9 @@
       "IPLimitlogclear": "清除日誌",
       "setDefaultCert": "從面板設定證書",
       "setDefaultCertEmpty": "面板尚未設定憑證。請先在「設定」中設定。",
-      "streamTab": "Stream",
+      "streamTab": "傳輸",
       "securityTab": "安全",
-      "sniffingTab": "Sniffing",
+      "sniffingTab": "嗅探",
       "sniffingMetadataOnly": "僅中繼資料",
       "sniffingRouteOnly": "僅路由",
       "sniffingIpsExcluded": "排除的 IP",