add help ID to 'Enable char units' checkbox
add help ID to 'Enable char units' checkbox

Change-Id: Ic968253460363c9d73ddc247d680f38f81df1272

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core