[StationeersSUI] Improve "Save Name" input label on the config page

[JacksonTheMaster]

The "Save Name" input label on the config page could tell users that changing this value would create a new save, so users can directly see (if they read) how to change their Server to a new map.

Name of the save folder, like 'MySave' or 'Europa Brutal'

[JacksonTheMaster]

@akirilov I assigned you here for now. Changing this would require a minor edit to the localization json files somewhere in UIMod/onboard_bundled