Bug fixes for dates in 2 views, likely to appear in 1.5.1

A couple of bugs were fixed regarding the localizability of certain dates display.
Cookies Info sheet: https://bugzilla.mozilla.org/show_bug.cgi?id=335985
History view: https://bugzilla.mozilla.org/show_bug.cgi?id=335986

While we try to keep minor updates (like 1.5.1, 1.5.2...) string-freezed, I think this ones are likely (and better) land on next 1.5 updates rather than 1.6.
I don't know if they will require work, but we must keep an eye on them.

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