You must copy your xx.mo file ("compiled" version of the .po file created when saving .po in poEdit) under "/usr/share/locale/xx/LC_MESSAGES/notecase.mo" on Linux platform, or under "notecase_install_dir/locale/xx/LC_MESSAGES/notecase.mo" on Windows platform, where:
xx equals your language code
notecase_install_dir equals directory where NoteCase is installed under Windows
If the latest catalog template belongs to yet unreleased version of the NoteCase you might not be able to test the translations. If this is the case,
contact me and I'll arrange sending you a latest development version of NoteCase.
Additionally, some phrases have _ (underscore) character inside them. It marks the character (first one after underscore) that will be underlined and used as a menu shortcut. When translating such phrases, please choose one character in your translation to be underlined, but take care not to have two items in the same menu having the same shortcut character.