specify lang in downloads

- asrob-uc3m/robotDevastation#143
- asrob-uc3m/actas#148
- roboticslab-uc3m/questions-and-answers#63

en/README.md

@@ -12,5 +12,5 @@ Please comment publicly [HERE](https://github.com/asrob-uc3m/robotDevastation-us
 
 ### Additional notes
 
-* You can also download this manual in various formats: [pdf](https://legacy.gitbook.com/download/pdf/book/asrob-uc3m/robotDevastation-user-manual), [mobi](https://legacy.gitbook.com/download/mobi/book/asrob-uc3m/robotDevastation-user-manual), [epub](https://legacy.gitbook.com/download/epub/book/asrob-uc3m/robotDevastation-user-manual)
+* You can also download this manual in various formats: [pdf](https://legacy.gitbook.com/download/pdf/book/asrob-uc3m/robotDevastation-user-manual?lang=en), [mobi](https://legacy.gitbook.com/download/mobi/book/asrob-uc3m/robotDevastation-user-manual?lang=en), [epub](https://legacy.gitbook.com/download/epub/book/asrob-uc3m/robotDevastation-user-manual?lang=en)
 * The content of this manual is generated from files hosted on [GitHub](https://github.com/asrob-uc3m/robotDevastation-user-manual)

es/README.md

@@ -12,5 +12,5 @@ Por favor comenta de forma pública [AQUÍ](https://github.com/asrob-uc3m/robotD
 
 ### Notas adicionales
 
-* También puedes descargarte este manual en diversos formatos: [pdf](https://legacy.gitbook.com/download/pdf/book/asrob-uc3m/robotDevastation-user-manual), [mobi](https://legacy.gitbook.com/download/mobi/book/asrob-uc3m/robotDevastation-user-manual), [epub](https://legacy.gitbook.com/download/epub/book/asrob-uc3m/robotDevastation-user-manual)
+* También puedes descargarte este manual en diversos formatos: [pdf](https://legacy.gitbook.com/download/pdf/book/asrob-uc3m/robotDevastation-user-manual?lang=es), [mobi](https://legacy.gitbook.com/download/mobi/book/asrob-uc3m/robotDevastation-user-manual?lang=es), [epub](https://legacy.gitbook.com/download/epub/book/asrob-uc3m/robotDevastation-user-manual?lang=es)
 * El contenido de este manual se genera a partir de ficheros alojados en [GitHub](https://github.com/asrob-uc3m/robotDevastation-user-manual)