[LMS-2313] minor: code clarity improvement

...ient/web/client/application/menu/dataset/DataSetMenu.java

.../client/application/ui/data/AbstractExternalDataGrid.java

.../application/ui/data/DataSetUploadConfirmationDialog.java

...ent/web/client/application/ui/data/DataSetUploadForm.java

...penbis/generic/client/web/client/dto/ApplicationInfo.java

...nbis/generic/client/web/server/AbstractClientService.java

...ication/sample/AbstractGenericSampleRegisterEditForm.java