TYPO3 Core

The in the subject mentioned setting is per default set on "false".

In a conversation on TYPO3 Slack with @Christian Kuhn we came up with the idea to set this setting on true per default.

Why do we think this would be senseful?

1. Every filesystem nowadays can do this
2. The editors do not "remember" to not write umlauts in the filenames as they are accustomed to not pay attention to this on their computer file systems.
3. It would also contribute to the "Don't make me think" paradigm in user experience design.

Our suggestion:

- We enable it by default for TYPO3 11 LTS.
- If no issues arise with this after one year we can drop it completely with TYPO3 12 LTS.

Remark
We are aware that there is also the [SYS][systemLocale] setting which - I think - is not allowed to be empty if [SYS][utf8FileSystem] is set to true.
So we see that there might be some issue with this... but maybe this could be solved programmatically by putting a default system locale. So see it as a suggestion which might need further thinking.