provide switch to hide/show extensions

[tbsbdr]

Expected behaviour

• File extension should be visible by default (but default configurable by admin)
• user should have a way of hiding file extensions

Proposal

• define config.json option for "show/hide file extension" default value (fallback if undefined: show extensions)
• Provide a switch in the ⚙️ - Menu -> "File extensions [on/off]" to show/hide extensions; default: based on config.json option, see above
• Persist user choice in localstorage for now (similar to "show/hide hidden files")
• show/hide extensions also in the "rename" and "create" textfields (i.e. you can't accidentally change a file extension then any more)
• file name is also visible in the right sidebar header section ("FileInfo" component), needs to respect the user choice as well

Value

• groundwork for user testing
• groundwork for user settings
• enable targeting different user groups

[kulmann]

Valid request, no worries. ;-) Only thing I'm not sure about is what we should have as a default here.

[tbsbdr]

Thats actually my point - my proposal is to hide the file extensions by default (like in Windows and MacOS)

[kulmann]

ftr: we decided that we'll keep the default of showing file extensions and try to find out in user testing if users are able to find the option to show file extensions if they are initially hidden.