Re-enable Japanese from language selection menu

Contributes to issue CURA-3817.

resources/qml/Preferences/GeneralPage.qml

@@ -152,6 +152,7 @@ UM.PreferencesPage
                             append({ text: "Suomi", code: "fi" })
                             append({ text: "Français", code: "fr" })
                             append({ text: "Italiano", code: "it" })
+                            append({ text: "日本語", code: "jp" })
                             append({ text: "Nederlands", code: "nl" })
                             append({ text: "Português do Brasil", code: "ptbr" })
                             append({ text: "Русский", code: "ru" })