Adding another option to the discussion, you could consider the
multilingual subject classification scheme, Iconclass. See
http://www.iconclass.nl/
It uses alphanumeric codes to make the notations that you assign to
your photos language independent, but you can set up a system in such
a way that the codes are completely hidden.
For an example of the system implemented, you can have a look at:
http://www.kb.nl/kb/manuscripts/ under the 'Browse by Subject' heading.
(I made the 'Browse by Subject' part of this site, so I like giving it
as an example... ;-)
regards,
Etienne Posthumus
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http://www.mnemosyne.org/
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