patch 9.1.2119: tests: Test_language_cmd fails on OpenBSD

Problem:  tests: Test_language_cmd fails on OpenBSD because the test
          uses an invalid locale name and expects the command to produce
          an error. OpenBSD accepts (almost) any locale name as valid by
          design, so the :lang command succeeds and the test fails.
Solution: Slightly update the "bad" locale name to make it something
          that OpenBSD considers invalid by adding a dot (but not ending
          with ".UTF-8"). Maintain the original two underscores in the
          name because that ensures Windows will also see it as invalid
          (Kevin Goodsell).

closes: #19280

Signed-off-by: Kevin Goodsell <kevin-opensource@omegacrash.net>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/testdir/test_excmd.vim

@@ -236,8 +236,15 @@ endfunc
 func Test_language_cmd()
   CheckFeature multi_lang
 
-  call assert_fails('language ctype non_existing_lang', 'E197:')
-  call assert_fails('language time non_existing_lang', 'E197:')
+  " OpenBSD allows nearly arbitrary locale names, since it largely ignores them
+  " (see setlocale(3)). One useful exception for this test is that in doesn't
+  " allow names containing dots unless they end in '.UTF-8'.
+  "
+  " Windows also allows nonsensical locale names, though it seems to reject
+  " names with multiple underscores (possibly expecting 'language_region', but
+  " not 'language_region_additional').
+  call assert_fails('language ctype non_existing_lang.bad', 'E197:')
+  call assert_fails('language time non_existing_lang.bad', 'E197:')
 endfunc
 
 " Test for the :confirm command dialog

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2119,
 /**/
     2118,
 /**/