Bug 8044: (follow-up) fix warning and error messages in translate.pl

Bug 8044: (follow-up) fix warning and error messages in translate.pl

CHARSET is now automatically replaced by UTF-8, and 'update' creates the
PO file if it does not exist.

Also do not try to create PO files if POT file creation failed (when
there is no messages to translate for example).

+ add some verbosity
+ add Locale::Maketext and Locale::Maketext::Lexicon to Koha
dependencies

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>