Makefile: shorten tip about Unicode embedding time

The estimate about this step taking "up to a minute" really depends on
the machine we're compiling on.  For example, on an old or underpowered
machine, it may take _longer_ than a minute.  So this patch changes the
wording accordingly and puts the reason for the delay at the beginning.
Merge pull request #2648 from sunaku/makefile-message-clarity

Makefile: shorten tip about Unicode embedding time
Improve translator formatting

* Improve application stop reasons
* Include stacktrace in crash reports
Prepend -noshell and friends always within Cygwin

Signed-off-by: José Valim <jose.valim@plataformatec.com.br>
Set -noshell on bin/iex
Merge pull request #2651 from fishcakez/translator_format

Improve translator formatting