Change formato for numbers from 10.000,00 to 10'000.00

Add new language German (CH) in Administration -> Language

update ir_translation set lang = 'de_CH' where lang = 'de_DE'

update res_partner set lang = 'de_CH' where lang = 'de_DE'

update res_users set context_lang = 'de_CH' where context_lang = 'de_DE'

Change the language in the GTK-Client for each user to German(CH).