Change Does Not Exist to 'does not exist'.

src/test/regress/expected/euc_cn.out

 QUERY: drop table 计算机术语;
-ERROR:  Relation 计算机术语 Does Not Exist!
+ERROR:  Relation 计算机术语 does not exist!
 QUERY: create table 计算机术语(术语 text, 分类号 varchar, 备注1A char(16));
 QUERY: create index 计算机术语index1 on 计算机术语 using btree(术语);
 QUERY: create index 计算机术语index2 on 计算机术语 using btree(分类号);

src/test/regress/expected/euc_kr.out

 QUERY: drop table 計算機용어;
-ERROR:  Relation 計算機용어 Does Not Exist!
+ERROR:  Relation 計算機용어 does not exist!
 QUERY: create table 計算機용어 (용어 text, 分類코드 varchar, 비고1A라구 char(16));
 QUERY: create index 計算機용어index1 on 計算機용어 using btree (용어);
 QUERY: create index 計算機용어index2 on 計算機용어 using hash (分類코드);

src/test/regress/expected/euc_tw.out

 QUERY: drop table 燹俑骜砧;
-ERROR:  Relation 燹俑骜砧 Does Not Exist!
+ERROR:  Relation 燹俑骜砧 does not exist!
 QUERY: create table 燹俑骜砧 (如淦杀 text, 狞瞥婉螭 varchar, 氢蛇 varchar(16));
 QUERY: create index 燹俑骜砧index1 on 燹俑骜砧 using btree (如淦杀);
 QUERY: create index 燹俑骜砧index2 on 燹俑骜砧 using hash (狞瞥婉螭);

src/test/regress/expected/mule_internal.out

 QUERY: drop table גђ;
-ERROR:  Relation גђ Does Not Exist!
+ERROR:  Relation גђ does not exist!
 QUERY: create table גђ (ђ text, ʬ varchar, 1A char(16));
 QUERY: create index גђindex1 on גђ using btree (ђ);
 QUERY: create index גђindex2 on גђ using hash (ʬ);
@@ -86,7 +86,7 @@ QUERY: select *,substring(
 (3 rows)
 
 QUERY: drop table Ƒ㑻;
-ERROR:  Relation Ƒ㑻 Does Not Exist!
+ERROR:  Relation Ƒ㑻 does not exist!
 QUERY: create table Ƒ㑻( text, ֑ varchar, ע1A char(16));
 QUERY: create index Ƒ㑻index1 on Ƒ㑻 using btree();
 QUERY: create index Ƒ㑻index2 on Ƒ㑻 using btree(֑);
@@ -173,7 +173,7 @@ QUERY: select *,substring(
 (3 rows)
 
 QUERY: drop table ͪߩѦ듾;
-ERROR:  Relation ͪߩѦ듾 Does Not Exist!
+ERROR:  Relation ͪߩѦ듾 does not exist!
 QUERY: create table ͪߩѦ듾 (듾 text, “׾ړ varchar, 1A󓱸 char(16));
 QUERY: create index ͪߩѦ듾index1 on ͪߩѦ듾 using btree (듾);
 QUERY: create index ͪߩѦ듾index2 on ͪߩѦ듾 using hash (“׾ړ);
@@ -260,7 +260,7 @@ QUERY: select *,substring(
 (3 rows)
 
 QUERY: drop table test;
-ERROR:  Relation test Does Not Exist!
+ERROR:  Relation test does not exist!
 QUERY: create table test (t text);
 QUERY: insert into test values('ENGLISH');
 QUERY: insert into test values('FRANAIS');