locale-gen, localedef: add page (#16314)

Co-authored-by: Fazle Arefin <fazlearefin@users.noreply.github.com>

pages/linux/locale-gen.md

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+# locale-gen
+
+> Generate locales defined in `/etc/locale.gen`.
+> More information: <https://manned.org/locale-gen>.
+
+- Generate locales:
+
+`locale-gen`
+
+- Do not delete undefined locales:
+
+`locale-gen --keep-existing`

pages/linux/localedef.md

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+# localedef
+
+> Manage locale definition files.
+> More information: <https://manned.org/localedef>.
+
+- List compiled locales:
+
+`localedef --list-archive`
+
+- Display help:
+
+`localedef {{[-?|--help]}}`