tools: Use appropriate OUString functions on string constants
tools: Use appropriate OUString functions on string constants

Change-Id: Ifeb1aa309db401c9bb6e3184489c17d399cf145f

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