Last week I was asked how it could be that a German Photoshop CS5 from one day to another 'forgot' the German language and only shows English menus and dialog boxes.
I thought this couldn't be -- maybe the German resource had vanished or the order of the languages in the System Preferences was wrong.
But the German localization files in Contents » Resources were there, and the German language was the first language in System Preferences so I did some research on the issue.
Photoshop CS5 needs a file named tw10428.dat in a subfolder named Locales » de_DE » Support Files of its application directory.
If you install a new scanner or camera there might be dialog box that asks if the TWAIN driver should be updated/replaced. In some cases this results in moving this .dat-File to the Trash and Photoshop forgets its multilingual capability. Check before you empty the Trash. In my case it was also possible to copy the .dat-file from another Photoshop CS5 installation.
This problem only occurs with CS5 as far as I can tell (my Photoshop CS3 doesn't have any Locales Folder in the application's directory, and I don't own CS4 to test it there) and as far as some forum posts and the actual problem tell me this only occurs in case of doing a TWAIN driver installation/update.
I imagine this might also occur with localizations other than German.
[crarko adds: I haven't tested this one. In some of their programs Adobe has offered a Repair installation option, and if CS5 has that it might also work.]
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