Installed free version of gtranslate today on my joomla 2.5 website which is in development.
In the module manager, for setup of Gtranslate, I clicked the option for DropDown List, and in the listing of languages, for Show English, I clicked the button to display the US Flag as shown below. I then saved it but when I examine the website, the dropdown for languages still displays the GB Flag next to English in the drop down listing for Gtranslate. The only way I can display the US flag is by opting for Both Flags and Dropdown - but then it only dsiplays the US Flag above the dropdown.
As a GB flag XX As a US flag