when in portable configuration and changing the
launch browser on startup setting on /configservice
ref: http://zzz.i2p/topics/3347

Hide option on /configservice if not supported

Use Exception.getLocalizedMessage() everywhere
HomeHelper javadoc

Code from Jan. 2018, never checked in, probably untested,
definitely incomplete.

GraphHelper minor cleanup

Switch to AWT by default on Mac;
Hide DTG enable form on Mac until we fix headless override in i2prouter

restart required

  - Show systray controls for all OSes on /configservice
  - Implement backend for systray control

As a result, event log will now show "shutdown" instead of "crashed".

            extend shutdown timeouts for all archs.

  - Add support for requesting an encrypted reply
* NetDB:
  - Add support for encrypted DatabaseSearchReplyMessage and DatabaseStoreMessage
    in response to a DatabaseLookupMessage
* PRNG: Cleanups using Collections.singletonMap()
* Router utils: New RemovableSingletonSet
* TransientSessionKeyManager:
  - Support variable expiration for inbound tag sets
  - Several efficiency improvements
* VersionComparator: Add static method, use most places

    - Prep for ClientApp interface by storing context in a field,
      shuffle around what's static and what's not
      (ticket #347)
    - Remove ports from port mapper on shutdown, other changes to
      track actual ports better
      (ticket #731)
    - Hook in password manager using MD5, untested.
      (ticket #731)

    and determine Java version on Android

    - Fix failsafe shutdown hook broken in 0.8.8;
      HUP, INT, and TERM signals should now shut down cleanly.
    - Shutdown hook no longer prevents other hooks from running
    - Trap HUP, if router.gracefulHUP=true, and do graceful shutdown.
      Only under wrapper, non-Windows.
    - i2prouter stop now uses SIGTERM
    - Implement i2prouter graceful using SIGHUP (ticket #580)
    - Configure wrapper to ignore SIGUSR1 and SIGUSR2 as they will shut down
      or crash the JVM

    - Cancel our JVM shutdown hook when shutting down
    - Run a spinner task so shutdown always completes
    - exit() instead of halt() so other JVM shutdown hooks run
    - Prevent duplicate wrapper notifier hooks
    - Notify the wrapper twice, once for stopping and once for stopped

  * Shutdown:
    - Clear more resources in peer manager, netdb, stat manager,
      session key manager, naming service, tunnel dispatcher,
      OCMOSJ (result of testing with jvisualvm)
    - Don't call wrapper on shutdown (starting two threads) if we
      were started with runplain

      - Don't save config when checking for updates on configupdate.jsp
      - Rework ConfigRestartBean and tag
      - More tag fixups
      - Add lang=xx for testing
      - Add file for additional tagged strings

update Translation