Question about character entities management in Excel files (SDL Trados)

Hello,
I am a Freelance translator and I am trying the SDL Studio Trados 2015 to see if it can help me with website translations.
Usually, my clients send me Excel files with HTML code embedded. I learnt how to filter the embedded code, but I don't know how to manage the character entities (for example á for the character á or à forthe character à). 
If I work with an HTML file, SDL Trados can support the conversion of entities (Latin 1 in our case). So if I write the character á, SDL Trados will actually write &aacute; in the HTML file (as any HTML editor). However, if I work with an Excel file, I'm only able to filter tags like <p></p> or others, but I cannot convert entities.
Is there any solution to that? Any configuration I can do?
Please let me know.
Thank you in advance.
Javier
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