There are several reasons this could happen, including a browser problem or a change to Confluence's default language. These questions will help narrow it down.
Does this happen on:
And in Confluence Administration > Languages, what's the default language set to?
Here are my responses
Based on your answers, either the default language has changed (or rather, Confluence thinks it's changed) or someone has amended the headings in the macro.
If you edit the Task Report macro and look at the Columns to display option, are the values in English or Spanish? If they're in English, are they displayed in Spanish when you click Preview on the right-hand side of the macro?
That's a bit bizarre. The only other thing I can think to suggest is to change your default language to something else, e.g. if you're English (UK) change it to English (US), and then change it back again to force Confluence to use the right language.
If that doesn't work then I think you'd better put a support ticket in.....
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