Allow case insensitivity for Confluence - or make the search and indexing better

As a user of Confluence,
in order to find my stuff easier be it content or labels,
I want to be able to search case insensitive.

Acceptance criteria

• labels and content (consequently the pages they are on) can be found independently on how they are written (in terms of case, e.g. CamelCase or camelcase, ...)
• this is the default way it works

Note

• see also https://answers.atlassian.com/questions/13414134/answers/25145167?flashId=2031749391