app: split sanity check into early/late stages, to fix gegl translation
The GEGL ops sanity check causes all ops to be initialized. The strings used by their properties will pick the translation selected at the time of the check. It must therefore run after language intiailization, otherwise the selected translation would correspond to the system locale, even if the user selected a different language in the preferences. Split the sanity check into early and late stages. The early stage is run before the call to app_run(), as it did before, while the late stage is run during app_run(), after the configuration has been loaded. Currently, the GEGL ops check is the only late-stage check; all other checks are performed during the early stage.
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