Update the German error message translations (by Stefan Hinz)

and fix some Swedish too.

mysql-test/r/group_by.result

@@ -1676,7 +1676,7 @@ c	(SELECT a FROM t1 WHERE b = c)
 SELECT b c, (SELECT a FROM t1 WHERE b = c)
 FROM t1 
 HAVING b = 10;
-ERROR 42000: non-grouping field 'b' is used in HAVING clause
+ERROR 42000: Non-grouping field 'b' is used in HAVING clause
 SELECT MAX(b) c, (SELECT a FROM t1 WHERE b = c)
 FROM t1 
 HAVING b = 10;

mysql-test/r/having.result

@@ -419,7 +419,7 @@ select f1 from t1 group by f1 having max(f1)=f1;
 f1
 set session sql_mode='ONLY_FULL_GROUP_BY';
 select f1 from t1 having max(f1)=f1;
-ERROR 42000: non-grouping field 'f1' is used in HAVING clause
+ERROR 42000: Non-grouping field 'f1' is used in HAVING clause
 select f1 from t1 group by f1 having max(f1)=f1;
 f1
 set session sql_mode='';