bpo-33710: Deprecate l*gettext() and related functions in the gettext module. (GH-10139)

They return encoded bytes and are Python 2 artifacts.
diff --git a/Doc/library/gettext.rst b/Doc/library/gettext.rst
index 93748a2..0a9456a 100644
--- a/Doc/library/gettext.rst
+++ b/Doc/library/gettext.rst
@@ -53,6 +53,8 @@
    and :func:`ldngettext` functions.
    If *codeset* is omitted, then the current binding is returned.
 
+   .. deprecated-removed:: 3.8 3.10
+
 
 .. function:: textdomain(domain=None)
 
@@ -112,9 +114,9 @@
       Unicode strings instead, since most Python applications will want to
       manipulate human readable text as strings instead of bytes.  Further,
       it's possible that you may get unexpected Unicode-related exceptions
-      if there are encoding problems with the translated strings.  It is
-      possible that the ``l*()`` functions will be deprecated in future Python
-      versions due to their inherent problems and limitations.
+      if there are encoding problems with the translated strings.
+
+   .. deprecated-removed:: 3.8 3.10
 
 
 Note that GNU :program:`gettext` also defines a :func:`dcgettext` method, but
@@ -192,6 +194,9 @@
    .. versionchanged:: 3.3
       :exc:`IOError` used to be raised instead of :exc:`OSError`.
 
+   .. deprecated-removed:: 3.8 3.10
+      The *codeset* parameter.
+
 
 .. function:: install(domain, localedir=None, codeset=None, names=None)
 
@@ -212,6 +217,9 @@
    builtins namespace, so it is easily accessible in all modules of your
    application.
 
+   .. deprecated-removed:: 3.8 3.10
+      The *codeset* parameter.
+
 
 The :class:`NullTranslations` class
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -272,6 +280,8 @@
          These methods should be avoided in Python 3.  See the warning for the
          :func:`lgettext` function.
 
+      .. deprecated-removed:: 3.8 3.10
+
 
    .. method:: info()
 
@@ -288,11 +298,15 @@
       Return the encoding used to return translated messages in :meth:`.lgettext`
       and :meth:`.lngettext`.
 
+      .. deprecated-removed:: 3.8 3.10
+
 
    .. method:: set_output_charset(charset)
 
       Change the encoding used to return translated messages.
 
+      .. deprecated-removed:: 3.8 3.10
+
 
    .. method:: install(names=None)
 
@@ -393,6 +407,8 @@
          These methods should be avoided in Python 3.  See the warning for the
          :func:`lgettext` function.
 
+      .. deprecated-removed:: 3.8 3.10
+
 
 Solaris message catalog support
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^