Initial release of Croatian translation

Sorry, I don't know which "component" to set for this issue.

As discussed with Oswald Buddenhagen through GitHub, I'm sending these files for inclusion. I tried to send it through GitHub, but that is not possible. So Oswald suggested I should send it here ...

I've translated open source apps like Inkscape, Scribus, Gimp, Gramps and others into croatian in the past couple of months. My translations are not computer translated.

Please feel free how to cope with my data. The zip file consists of the following:

FINISHED = 100% translated
UNFINISHED = different percentage of translations

• FINISHED_Qt 5.13
  assistant_hr.ts
  designer_hr.ts
  linguist_hr.ts
  qt_help_hr.ts
  qt_hr.ts
  qtlocation_hr.ts
  qtmultimedia_hr.ts
  qtquickcontrols_hr.ts
  qtquickcontrols2_hr.ts
  qtscript_hr.ts
• FINISHED_Qt Installer Framework 3.0
  ifw_hr.ts
• UNFINISHED_Qt 5.13 ToDo
  qtbase_hr.ts
  qtconnectivity_hr.ts
  qtdeclarative_hr.ts
  qtxmlpatterns_hr.ts
• UNFINISHED_Qt Creator 4.9
  qtcreator_hr.ts