Bug 7841: quell warnings in C4::Languages

Bug 7841: quell warnings in C4::Languages

This patch removes some sources of warning messages thrown by
C4::Languages, particular getTranslatedLanguages() when running
Koha's web installer.

TEST PLAN
---------
1) Apply first patch
2) prove -v t/db_dependent/Languages.t
   -- There will be uninitialized string messages, etc.
3) Apply second patch (this one)
4) prove -v t/db_dependent/Languages.t
   -- Only one carp message will remain.

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Test pass, no warnings, no koha-qa errors

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>