How to say hello in different languages

The most useful word of all?

Hello in Afrikaans
Hello in Arabic
Hello in Bosnian
Hello in Bulgarian
Hello in Catalan
Hello in Croatian
Hello in Czech
Hello in Danish
Hello in Dutch
Hello in Estonian
Hello in Finnish
Hello in French
Hello in German
Hello in Greek
Hello in Hebrew
Hello in Hindi
Hello in Hungarian
Hello in Latvian
Hello in Lithuanian
Hello in Maltese
Hello in Polish
Hello in Portuguese
Hello in Romanian
Hello in Russian
Hello in Slovak
Hello in Spanish
Hello in Swahili
Hello in Swedish
Hello in Ukrainian
Hello in Welsh