Using wpForo Phrase system XML file: https://wpforo.com/community/faq/how-to-translate/
Here it says "3. Use attached xml file" but no file is attached. Can someone upload one of these xmls?
If you're just translating the forum, please use Loco Translate plugin (for multi-language websites) or Edit phrases in Forums > Phrases admin page (in case you have only one language). You have nothing to do with phrase XML files.
@robert my website is spanish/english, but wpForo shows up only in english, it ignores my wordpress configuration
How have you set your website in two languages? Do you use any multi-language plugin?
@robert yes, I use polylang
Here is a good topic about the polylang plugin: https://wpforo.com/community/how-to-and-troubleshooting-2/multilingual-issues/#post-54932
This plugin is not compatible with wpForo.