Resolve lintVitalRelease ExtraTranslation failures by restoring missing default string keys

[Copilot]

app:lintVitalRelease was failing on ExtraTranslation because multiple locale-specific strings.xml entries no longer had corresponding keys in the default values/strings.xml. This PR restores default-locale coverage for those keys so translated resources are consistent with the base locale.

• Root cause addressed

  • Reintroduced missing default string resources that were still present in localized bundles (VI/JA/KO/ZH/RU), eliminating the mismatch that triggered ExtraTranslation.

• Resource sync updates

  • Added default entries for update/profile/provider/script/sideload/sniffer-related keys, including:
    • format_update_complete, format_update_failure
    • profile_process_result, profile_process_status, profile_service_status, profile_updater, profile_updating
    • provider_files, script_mode
    • sideload_geoip, sideload_geoip_summary
    • sniffing, sniff, port_whitelist, disable_sniffer, sniffer_config, sniffer_override
    • update_failure, update_successfully

• Minor wording normalization

  • Refined two newly added default messages for clearer English:
    • format_update_complete: "Update %s completed"
    • update_successfully: "Update successful"

<!-- app/src/main/res/values/strings.xml -->
<string name="sniffing">Sniffer Mode</string>
<string name="port_whitelist">Port Whitelist</string>
<string name="disable_sniffer">Disable Sniffer</string>
<string name="sniffer_config">Load Sniffer From Config</string>
<string name="sniffer_override">Override Sniffer Config</string>