Edited helptext in corpus view > datum field settings
Edited helptext in corpus view > datum field settings

Made helptext shorter, add examples of what each datum field could look
like, and fixed typos.


Former-commit-id: da47b5bd944a5a1d1f304fb9f0e631592ca477e3
vronvali/iLanguage,cesine/iLanguage,iLanguage/iLanguage,cesine/iLanguage,cesine/iLanguage,cesine/iLanguage,vronvali/iLanguage,iLanguage/iLanguage,vronvali/iLanguage,vronvali/iLanguage,iLanguage/iLanguage,cesine/iLanguage,vronvali/iLanguage,vronvali/iLanguage,iLanguage/iLanguage,iLanguage/iLanguage