[RFC][PATCH] minimal i18n support: default _() pass-through function; 'make pot' will create PO template

[Alexander Belchenko]

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The subject says all.
This is very minimal background to start working on
preparing bzrlib string resources to translations.

With this patch bzrlib can use _() without any errors,
(but and without using translations in runtime)
and we able to upload POT file in Rosetta.

Now I convert only short help to translatable form,
as example.

[µ]
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