templater: restore the original string format of {date}
Unfortunately, python-hglib relies on that. I could fix python-hglib, but
there would be other tools that take a decimal separator as the separator
of unixtime and tzoffset.
The showfmt is set per instance since new code uses '%d %d' format by default.
{
// Enforcing
"eqeqeq" : true, // true: Require triple equals (===) for comparison
"forin" : true, // true: Require filtering for..in loops with obj.hasOwnProperty()
"freeze" : true, // true: prohibits overwriting prototypes of native objects such as Array, Date etc.
"nonbsp" : true, // true: Prohibit "non-breaking whitespace" characters.
"undef" : true, // true: Require all non-global variables to be declared (prevents global leaks)
// Environments
"browser" : true // Web Browser (window, document, etc)
}