我只找到了 gtranslate 的 joomla 插件的前端部分代码：
modules/mod_gtranslate/
但是没有找到后台的相关逻辑。于是干脆从数据库里找存储位置：
SELECT * FROM `xxx_modules`
可以找到一个 gtranslate 的配置项，里面的 params 字段存储了相关的配置。
这个字段是个 json 字符串，里面的 languages 存储了多语言列表。例如：
["en","ar","zh-CN","cs","nl","fi","fr","de","it","ko","pl","pt","ro","ru","es","sv","ca","tl","iw","id","sr","sk","uk","vi","et","th","tr","fa","ms","be","hy","az","eu","ur","bn","la","kk","uz","ky"]
语言 logo
https://cdn.gtranslate.net/flags/svg/en-us.svg
以英语为例，可以直接读取上面的 svg logo。
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