Update translation of 'Stabilization' field  in 'possible_values' table.

- The field now states that the dataset will be stabilized "if possible". This needs to be clearly stated this way because HuCore will make a distinction between 'traditional' STED datasets and STED 3D datasets. Namely, the stabilization will be skipped at runtime if the STED 3D parameter is high enough as to generate a short PSF (in Z). Therefore, this is unknown beforehand and has to be checked at runtime.