No, this is not a spam message. No, this is not an advertisement. No, it does not have a political implication. Yes, To make the WordWall program in Czech, you would need to check if the program supports language localization or has a language option for Czech. You can usually change the language settings within the program's settings or preferences. As for whether it is free or not, the pricing and availability may vary, so it is best to visit the program's official website or contact their support for accurate information. To obtain an invitation code, you would need to follow the specific instructions provided by the program or platform. This could involve signing up, requesting an invitation, or receiving it from a current user. Again, it is recommended to visit the program's website or contact their support for more details on how to obtain the invitation code.