diff --git a/languages/ja-JP-help.lang.json b/languages/ja-JP-help.lang.json
index e034a725..4232ac73 100644
--- a/languages/ja-JP-help.lang.json
+++ b/languages/ja-JP-help.lang.json
@@ -1,5 +1,5 @@
 {
-  "= Help Topics =\n\nCommands:\n%s\n\nRPL_ISUPPORT Tokens:\n%s\n\nInformation:\n%s": "",
+  "= Help Topics =\n\nCommands:\n%[1]s\n\nRPL_ISUPPORT Tokens:\n%[2]s\n\nInformation:\n%[3]s": "",
   "== Channel Modes ==\n\nOragono supports the following channel modes:\n\n  +b  |  Client masks that are banned from the channel (e.g. *!*@127.0.0.1)\n  +e  |  Client masks that are exempted from bans.\n  +I  |  Client masks that are exempted from the invite-only flag.\n  +i  |  Invite-only mode, only invited clients can join the channel.\n  +k  |  Key required when joining the channel.\n  +l  |  Client join limit for the channel.\n  +m  |  Moderated mode, only privileged clients can talk on the channel.\n  +n  |  No-outside-messages mode, only users that are on the channel can send\n      |  messages to it.\n  +R  |  Only registered users can talk in the channel.\n  +s  |  Secret mode, channel won't show up in /LIST or whois replies.\n  +t  |  Only channel opers can modify the topic.\n\n= Prefixes =\n\n  +q (~)  |  Founder channel mode.\n  +a (&)  |  Admin channel mode.\n  +o (@)  |  Operator channel mode.\n  +h (%)  |  Halfop channel mode.\n  +v (+)  |  Voice channel mode.": "",
   "== Server Notice Masks ==\n\nOragono supports the following server notice masks for operators:\n\n  a  |  Local announcements.\n  c  |  Local client connections.\n  j  |  Local channel actions.\n  k  |  Local kills.\n  n  |  Local nick changes.\n  o  |  Local oper actions.\n  q  |  Local quits.\n  t  |  Local /STATS usage.\n  u  |  Local client account actions.\n  x  |  Local X-lines (DLINE/KLINE/etc).\n\nTo set a snomask, do this with your nickname:\n\n  /MODE <nick> +s <chars>\n\nFor instance, this would set the kill, oper, account and xline snomasks on dan:\n\n  /MODE dan +s koux": "",
   "== User Modes ==\n\nOragono supports the following user modes:\n\n  +a  |  User is marked as being away. This mode is set with the /AWAY command.\n  +i  |  User is marked as invisible (their channels are hidden from whois replies).\n  +o  |  User is an IRC operator.\n  +R  |  User only accepts messages from other registered users. \n  +s  |  Server Notice Masks (see help with /HELPOP snomasks).\n  +Z  |  User is connected via TLS.": "",
@@ -10,11 +10,13 @@
   "AWAY [message]\n\nIf [message] is sent, marks you away. If [message] is not sent, marks you no\nlonger away.": "",
   "CAP <subcommand> [:<capabilities>]\n\nUsed in capability negotiation. See the IRCv3 specs for more info:\nhttp://ircv3.net/specs/core/capability-negotiation-3.1.html\nhttp://ircv3.net/specs/core/capability-negotiation-3.2.html": "",
   "CHANSERV <subcommand> [params]\n\nChanServ controls channel registrations.": "",
+  "CHATHISTORY [params]\n\nCHATHISTORY is an experimental history replay command. See these documents:\nhttps://github.com/MuffinMedic/ircv3-specifications/blob/chathistory/extensions/chathistory.md\nhttps://gist.github.com/DanielOaks/c104ad6e8759c01eb5c826d627caf80d": "",
   "CS <subcommand> [params]\n\nChanServ controls channel registrations.": "",
   "DEBUG <option>\n\nPrints debug information about the IRCd. <option> can be one of:\n\n* GCSTATS: Garbage control statistics.\n* NUMGOROUTINE: Number of goroutines in use.\n* STARTCPUPROFILE: Starts the CPU profiler.\n* STOPCPUPROFILE: Stops the CPU profiler.\n* PROFILEHEAP: Writes out the CPU profiler info.": "",
   "DLINE [ANDKILL] [MYSELF] [duration] <ip>/<net> [ON <server>] [reason [| oper reason]]\nDLINE LIST\n\nBans an IP address or network from connecting to the server. If the duration is\ngiven then only for that long. The reason is shown to the user themselves, but\neveryone else will see a standard message. The oper reason is shown to\noperators getting info about the DLINEs that exist.\n\nBans are saved across subsequent launches of the server.\n\n\"ANDKILL\" means that all matching clients are also removed from the server.\n\n\"MYSELF\" is required when the DLINE matches the address the person applying it is connected\nfrom. If \"MYSELF\" is not given, trying to DLINE yourself will result in an error.\n\n[duration] can be of the following forms:\n\t1y 12mo 31d 10h 8m 13s\n\n<net> is specified in typical CIDR notation. For example:\n\t127.0.0.1/8\n\t8.8.8.8/24\n\nON <server> specifies that the ban is to be set on that specific server.\n\n[reason] and [oper reason], if they exist, are separated by a vertical bar (|).\n\nIf \"DLINE LIST\" is sent, the server sends back a list of our current DLINEs.": "",
   "HELP <argument>\n\nGet an explanation of <argument>, or \"index\" for a list of help topics.": "",
   "HELPOP <argument>\n\nGet an explanation of <argument>, or \"index\" for a list of help topics.": "",
+  "HISTORY <target> [limit]\n\nReplay message history. <target> can be a channel name, \"me\" to replay direct\nmessage history, or a nickname to replay another client's direct message\nhistory (they must be logged into the same account as you). At most [limit]\nmessages will be replayed.": "",
   "HOSTSERV <command> [params]\n\nHostServ lets you manage your vhost (a string displayed in place of your\nreal hostname).": "",
   "HS <command> [params]\n\nHostServ lets you manage your vhost (a string displayed in place of your\nreal hostname).": "",
   "INFO\n\nSends information about the server, developers, etc.": "",
@@ -53,6 +55,7 @@
   "SAMODE <target> [<modestring> [<mode arguments>...]]\n\nForcibly sets and removes modes from the given target -- only available to\nopers. For more specific information on mode characters, see the help for\n\"cmode\" and \"umode\".": "",
   "SANICK <currentnick> <newnick>\n\nGives the given user a new nickname.": "",
   "SCENE <target> <text to be sent>\n\nThe SCENE command is used to send a scene notification to the given target.": "",
+  "SETNAME <realname>\n\nThe SETNAME command updates the realname to be the newly-given one.": "",
   "TIME [server]\n\nShows the time of the current, or the given, server.": "",
   "TOPIC <channel> [topic]\n\nIf [topic] is given, sets the topic in the channel to that. If [topic] is not\ngiven, views the current topic on the channel.": "",
   "UNDLINE <ip>/<net>\n\nRemoves an existing ban on an IP address or a network.\n\n<net> is specified in typical CIDR notation. For example:\n\t127.0.0.1/8\n\t8.8.8.8/24": "",