i18npool: Use appropriate OUString functions on string constants

Change-Id: I82fea345a05c0327af3b75ccfd3358f54523c082
i18nutil: Use appropriate OUString functions on string constants

Change-Id: I09f6c1d793c6d4f61c25649cfb463a41d88b23df
linguistic: Use appropriate OUString functions on string constants

Change-Id: I76ee3a435ac7a49308db497306b5a9404f3c3ba0
pyuno: Use appropriate OUString functions on string constants

Change-Id: Ib507da6fc85d8bc81fd48108a98ef96d188643ac
sal: Use appropriate OUString functions on string constants

Change-Id: I568c2e0c9b5b234d941e17d57bcb53374626909e
svl: Use appropriate OUString functions on string constants

Change-Id: I8d8528c74bae3de67a0a9bdd727cd0d8c8304d3e
svtools: Use appropriate OUString functions on string constants

Change-Id: I8799033322d345b2f146c3577d3d264448252816
toolkit: Use appropriate OUString functions on string constants

Change-Id: I3bb1e560eb325046f5b170da0c4c46c1139f3225
testtools: Use appropriate OUString functions on string constants

Change-Id: I5cb34d95e2a59ff6a3f5189beb40b7dbf574dc29
unotools: Use appropriate OUString functions on string constants

Change-Id: I14d3a3187b8528e3ff9743245b869773c2eb5e98