13. A computer program product for optimizing a multi-language user interface layout via reverse pseudo-translation, the computer program product comprising: one or more non-transitory computer-readable tangible storage medium and program instructions stored on at least one of the one or more non-transitory tangible storage medium, the program instructions executable by a processor, the program instructions comprising: program instructions to select at least one user interface page from a group of user interface pages in a language; program instructions to select at least one target language from a group of target languages to pseudo-translate the at least one user interface page; program instructions to specify at least one layout requirement for formatting the selected at least one user interface page; program instructions to perform pseudo-translation of the at least one user interface page based on the selected at least one target language; program instructions to modify, by a merge algorithm, the at least one pseudo-translated user interface page according to the at least one specified layout requirement, wherein the merge algorithm comprises: applying the at least one specified layout requirement to the at least one pseudo-translated user interface page, wherein the at least one specified layout requirement is applied to the at least one pseudo-translated user interface page in a hierarchy from a most shared selected layout property among the at least one selected target language to a least shared selected layout property among the at least one selected target language; and program instructions to implement a reverse pseudo-translation of the at least one modified pseudo-translated user interface page.
16. The computer program product of claim 13 , further comprising: program instructions to create an integrated development environment, wherein the integrated development environment is created by a developer for at least one of the selection of the at least one user interface page; the selection of the at least one target language; and the specification of the at least one layout requirement.