Enhance filename and display name synchronization on document upload #415
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When uploading files, you can already synchronize the file name with the display name. The pattern '[\W_]' is currently used to replace all non-word characters with '_'. However, this procedure also replaces umlauts or other letters with accents. I have therefore extended the previous process so that umlauts and letters with accents are replaced accordingly. For the replacement rule for letters with accents, I have relied on 'source internet', as I do not speak all languages.
What's not particularly nice about the current solution is that 'toLowerCase()' and the two RegEx run over the filename a total of three times. If anyone has a better solution, please let me know :)