Well if you keep your ini's/configuration in default folder, after "clearing all settings" and using default, you'll only need to choose plugins, but their config isn't cleared by this option, and maybe apply speedhacks if you need them, but that's like 2 clicks and usually is changed for each game anyway. There is also option to import existing settings when you reset config which will save everything, but then it'll import your previous language setting too and you don't want that.
"Exporting settings" doesn't really need any option, just backup your "inis" folder, by default it's
and restore if you want, but that's all settings including gui language.
If you really feel like simple choosing plugins and applying speedhacks you used is troublesome, just edit that ini manually it's simple - really.
Like I said use notepad to open PCSX2_ui.ini (by default in above folder) look inside for
and change it to any of the below:
where default = OS language(only among existing translations), all the rest is currently supported languages took from the latest pcsx2/langs folder, can be shorter for the 0.9.8.