Support arguments in i18n

[karollewandowski]

Correct me if I'm wrong, but it looks like it is not possible to pass translation arguments in HTL.

Proposal

Example with single argument

Dictionary entry: user.greeting=Hello {0}!
Usage:

${'user.greeting' @ i18n, args='Karol'} <!-- prints: Hello Karol! -->

Example with multiple arguments

Dictionary entry: user.greeting=Hello {0}, you have {1} unread messages.
Usage:

${'user.greeting' @ i18n, args=['Karol', 21]} <!-- prints: Hello Karol, you have 21 unread messages. -->

[karollewandowski]

I've just found out it should be done with format option and is even mentioned in specification under format section. I think it would be good to mention it in i18n section as well.
My bad, sorry for spam.