Wrong plural forms in translations

[Withalion]

Currently we don't have correct translations for languages with multiple plural forms. Fortunately the translation framework supports this, but our code doesn't. Often times we pass the string for translation as tr( QStringLiteral("I love %1 apple(s)").arg(appleCount)), however this format doesn't generate the multiple plural forms for languages that need that. We should change it to tr( "I love %n apple(s)", "", appleCount). More info. Another improvement would be to also change code which uses ternary operators to decide between plural and singular forms

Example:

• the notification text is in Slovak and the language has 3 plural forms, the last word is in 3. form but should be in 2.

Thanks @RastoHu for catching this.

[RastoHu]

Similar with translation of months in calendar:

[IvaKuklica]

Additional in Polish language - "Select more"not translated.