Remove shebang from all gatoscript modules.

GatoScript can't run outside of X-Chat or Hexchat, so having a shebang
is unnecesary can confuse somebody.
Translate menu entries
Translate KBTEMP function
Translate scriptdirs() docstring and reuse some variables

_SCRIPTDIR and _GATODIR are defined already, so reuse them.
Style. Change string formating to an easier to read one.
Update script definition variables, version number.

Change version number to 2.0-alpha since I'll skyp the 1.5 and go
stright to 2.0.
Translation of name and description.
Update copyright line
Translate database management variables
Translate gprint function.
Rename priv_imprime() as query_print() and translate it.
Rename lee_conf() as conf_read() and translate it
Rename escribe_conf() to conf_write() and translate it.
Translate module docstring.
Translate most comments.
Translate the gato_info_cb() function
Rename unidades() function as units() and translate it.

Fixes a bug where 1024 was used as the base even when 1000 was selected.
Translate gatodb_cursor_execute()
Rename priv_linea() function as query_line() and translate it.
Rename expulsa() function as expel() and translate it.
Rename opciones_cb() function as options_cb() and translate it

The function was partialy rewriten to show usage information when the
wrong number of parammeters is used instead of just complaining.