Introduce LLAppViewer::initStrings(); reload default_trans_args.

Calling LLTrans::setDefaultArg() after LLTransUtil::parseStrings() is almost
good enough -- but it fails to address the case in which one or more of the
default_trans_args strings (e.g. "create_account_url") embeds a reference to
the new substitution. So after the setDefaultArg() call, go back through
default_trans_args, refetching each string to perform the substitution and
updating it with a setDefaultArg() call of its own. All this is way too much
logic to replicate in both LLAppViewer::initConfiguration() and init(), so
break out new LLAppViewer::initStrings() method and call it from both places.

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