Misspelling in sysop command menu and string commands help

Caught a couple misspellings in the sysop commands menu and the string commands help. I don't have rights to commit the changes myself.

text/menu/sysmain.asc

3: preceded, not preceeded (there are a lot of “preceeded” in various files)

exec/str_commands.js

80: comma before “as well as”
80: current, not currrent
80: optionally, not opptionally
80: nodes', not nodes

155: JavaScript, not JavaScirpt