How to change language in Mozilla Firefox from Indian language to English?

On the Yahoo website, I changed my webpage language from English to Telugu (One of the Indian languages). It did it successfully. But now, all webpages are displayed in Telugu language where ever possible and where it is not, it is showing error message. I changed the settings in Mozilla Firefox -->... show more On the Yahoo website, I changed my webpage language from English to Telugu (One of the Indian languages). It did it successfully. But now, all webpages are displayed in Telugu language where ever possible and where it is not, it is showing error message.

I changed the settings in Mozilla Firefox --> "Tools" --> "Options" --> "Content" --> Language to English/US.

I also changed the settings in Mozilla Firefox --> "View" --> "Character Encoding" --> "Unicode (UTF-8) option.

But still the displaying language has not changed to English. Any suggestions please?
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