At the moment a letter carrying an accent (in a keyword, a photo title, etc) is treated as being distinct from a letter without one - "théâtre" and "café" are not equivalent, are not implicit synonyms for "theatre" and "cafe". Moreover an uppercase accented letter is not considered equivalent to a lowercase one: Ô and ô are not the same. This seems to me to be totally counter-intuitive, especially when we are used to services like Google which do treat these forms as being equivalent. If I have a photo of "Le Théâtre de la Comédie Française" and another of "The Roundhouse Theatre" I'd expect to able to find both using a filter on either "theatre" or "théâtre" out-of-the-box with at most a configuration option to tick. Admittedly that wouldn't solve the problem of American English spellings (that I, personally, would only use in proper names anyway). It should also be possible to have a search for "osaka", "Ôsaka", and "ôsaka" produce identical results out-of-the-box (if you don't use accents "Osaka" and "osaka" does). "Ôsaka", "ôsaka", when entered as keywords should be treated as being strictly identical.