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There is a push button labeled "Show only modified" in [[Special:Allmessages]] to toggle between displaying all or only modified messages. There is 
no visual feedback to indicate wheter all or only modified messages are shown (except the displayed table itself). Even worse: if only modified 
messages are shown already, the button still reads "Show only modified" suggesting this setting isn't active.

Usually GUIs use a checkbox (or a "sticky" button) to toggle such a setting. On HTML pages push buttons are typically used to submit or reset a form 
or to perform any other single action, not to toggle a setting.

Change this interface or provide a visual feedback in or close to the button for a better user experience.