An user should never touch anything under /usr/share, all the files there WILL be overwritten on package updates. Most sane packages include a warning about this in a comment of each config file. If you need to modify anything, you should copy it to either /etc or .config. Programs should use the config with the highest priority (.config > /etc > /usr/share) and ignore the rest or merge them with settings from higher priority config taking precedence.
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