Upgrade Smarty to v3

[asmecher]

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[asmecher]

@NateWr, one of the changes required in preparation for the upgrade to Smarty3 is to stop using our own custom |assign modifier, e.g.:

{translate|assign:"myVariableName key="some.locale.key.here"}

Instead, this needs to be wrapped in the standard {capture} function, e.g.:

{capture assign="myVariableName"}{translate key="some.locale.key.here"}{/capture}

This syntax is a little clunkier, but it's standard, and because of some nasty Smarty internals, it's a necessary change IMO.

This will definitely affect some of your theme templates -- I've already prepared a PR for the Bootstrap theme.

I haven't decided yet when to merge the Smarty3 upgrade, but converting |assign calls to {capture} works with Smarty2 and would probably be a good thing to do ASAP.

[asmecher]

Merged & closed!

[asmecher]

(Thanks for a very helpful couple of review rounds, @NateWr.)