Render the syslog keyword POSIX publishes, keeping RFC 5424's severity beside it

data/misc/loglevel.json

@@ -1 +1 @@
-{ "format": "{severity}", "rows": "loglevel.tsv", "key": "code", "name": "severity" }
+{ "format": "{keyword}", "rows": "loglevel.tsv", "key": "code", "name": "keyword" }

data/misc/loglevel.tsv

@@ -1,9 +1,9 @@
-code	severity
-0	Emergency
-1	Alert
-2	Critical
-3	Error
-4	Warning
-5	Notice
-6	Informational
-7	Debug
+code	keyword	severity
+0	emerg	Emergency
+1	alert	Alert
+2	crit	Critical
+3	err	Error
+4	warning	Warning
+5	notice	Notice
+6	info	Informational
+7	debug	Debug