Is there any configuration to change the LuCi language to Spanish?
You need to install a package called “luci-i18n-base-es” or “luci-i18n-spanish” to change the language 
I have a my GL-MT300N-V2 and the Spanish language does not appear, it tells me this error:
Unknown package ‘luci-i18n’.
Collected errors:
- opkg_install_cmd: Cannot install package luci-i18n.
You must write the entire thing, not just half.
I wrote it in both ways and it gives me the same error
I want to put the interface in Spanish because it’s my language, it tells me this error:
Unknown package ‘luci-i18n-base-es’.
Collected errors:
- opkg_install_cmd: Cannot install package luci-i18n-base-es.
Ah, i see you didn’t do “update lists”. Press that button in the screenshot above, and then search for the package. Doesn’t work if you haven’t updated the package list.
Downloading 404 Page not found - GL.iNet
*** Failed to download the package list from 404 Page not found - GL.iNet
Failed to establish connection
Collected errors:
- opkg_download: Failed to download 404 Page not found - GL.iNet, wget returned 4
Seems you lost connection. It is ok for my testing.
root@RVIT_client22:/# cat /etc/glversion
2.271
root@RVIT_client22:/# opkg update
Downloading http://www.gl-inet.com/lede/2.271/ramips/mt7628/Packages.gz
Updated list of available packages in /var/opkg-lists/packages
Downloading http://www.gl-inet.com/lede/2.271/ramips/mt7628/Packages.sig
Signature check passed.
root@RVIT_client22:/# opkg install luci-i18n-base-es
Installing luci-i18n-base-es (git-17.290.79498-d3f0685-1) to root...
Downloading http://www.gl-inet.com/lede/2.271/ramips/mt7628/luci-i18n-base-es_git-17.290.79498-d3f0685-1_all.ipk
Configuring luci-i18n-base-es.
I have internet and I connect to the repeater I can access a facebook, but from the repeater in LuCi I get this errror