reaction plugin: update help text to match new syntax
[rbot] / po /
drwxr-xr-x   ..
drwxr-xr-x - en_US
drwxr-xr-x - it
drwxr-xr-x - ja
-rw-r--r-- 33694 rbot.pot
drwxr-xr-x - zh_CN
drwxr-xr-x - zh_TW