All three extensions are normally included in PHP when using the default compile parameters, but you can compile PHP without them, so it is possible that they are missing which breaks Matomo.
Weirdly the translation string for
Installation_SystemCheckHashHelp already existed.
I also changed
SystemCheckWarnJsonHelp as I doubt Matomo will work at all without json support. (and it is in the list of required extensions)
Thanks @Findus23 for picking up the issue and creating this (and the other) pr! :+1: