Change Gmail Icons to Text
Google have introduced a setting to change the top grey button icons that appear when an email is selected.
If you are not a fan of the new icons within the grey buttons that appear at the top of Gmail when you select an email, you can now set them to more descriptive text. To do so, click the top right cog and select Mail Settings, then in the General tab scroll down to Button Labels and select Text. Save your settings and the icons on the buttons will be replaced by text.