MDEV-9928 LC_TIME_NAMES=de_AT; unusual name for february

s/Feber/Februar/

mysql-test/r/locale.result

@@ -90,3 +90,14 @@ SELECT DATE_FORMAT('2001-01-07', '%w %a %W');
 DATE_FORMAT('2001-01-07', '%w %a %W')
 0 Du Duminică
 End of 5.4 tests
+SET NAMES utf8;
+SET lc_time_names=de_AT;
+SELECT monthname('2001-01-01');
+monthname('2001-01-01')
+Jänner
+SELECT monthname('2001-02-01');
+monthname('2001-02-01')
+Februar
+SELECT monthname('2001-03-01');
+monthname('2001-03-01')
+März

mysql-test/t/locale.test

@@ -54,3 +54,12 @@ SELECT DATE_FORMAT('2001-01-05', '%w %a %W');
 SELECT DATE_FORMAT('2001-01-06', '%w %a %W');
 SELECT DATE_FORMAT('2001-01-07', '%w %a %W');
 --echo End of 5.4 tests
+
+#
+# MDEV-9928 LC_TIME_NAMES=de_AT; unusual name for february
+#
+SET NAMES utf8;
+SET lc_time_names=de_AT;
+SELECT monthname('2001-01-01');
+SELECT monthname('2001-02-01');
+SELECT monthname('2001-03-01');

sql/sql_locale.cc

@@ -426,7 +426,7 @@ MY_LOCALE my_locale_da_DK
 
 /***** LOCALE BEGIN de_AT: German - Austria *****/
 static const char *my_locale_month_names_de_AT[13] = 
- {"Jänner","Feber","März","April","Mai","Juni","Juli","August","September","Oktober","November","Dezember", NullS };
+ {"Jänner","Februar","März","April","Mai","Juni","Juli","August","September","Oktober","November","Dezember", NullS };
 static const char *my_locale_ab_month_names_de_AT[13] = 
  {"Jän","Feb","Mär","Apr","Mai","Jun","Jul","Aug","Sep","Okt","Nov","Dez", NullS };
 static const char *my_locale_day_names_de_AT[8] =