Update cheatsheets

tldr/linux/eselect-locale

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# eselect locale
+
+> An `eselect` module for managing the `LANG` environment variable, which sets the system language.
+> More information: <https://wiki.gentoo.org/wiki/Eselect#Locale>.
+
+- List available locales:
+
+`eselect locale list`
+
+- Set the `LANG` environment variable in `/etc/profile.env` by name or index from the `list` command:
+
+`eselect locale set {{name|index}}`
+
+- Display the value of `LANG` in `/etc/profile.env`:
+
+`eselect locale show`