diff --git a/src/po/ko.po b/src/po/ko.po
index ab957a5e18..2b3c78568e 100644
--- a/src/po/ko.po
+++ b/src/po/ko.po
@@ -1,8 +1,8 @@
-# Generated from ko.UTF-8.po, DO NOT EDIT
+# Korean translation for Vim
 #
 # FIRST AUTHOR SungHyun Nam <goweol@gmail.com>, 2000-2018
 #
-# Original translations.
+# Generated from ko.UTF-8.po, DO NOT EDIT.
 #
 msgid ""
 msgstr ""
@@ -14,7 +14,7 @@ msgstr ""
 "Language-Team: Korean\n"
 "Language: ko\n"
 "MIME-Version: 1.0\n"
-"Content-Type: text/plain; charset=euc-kr\n"
+"Content-Type: text/plain; charset=EUC-KR\n"
 "Content-Transfer-Encoding: 8bit\n"
 "Plural-Forms: nplurals=1; plural=0;\n"
 
diff --git a/src/po/pl.cp1250.po b/src/po/pl.cp1250.po
index b748b4a22f..6f9b66dd59 100644
--- a/src/po/pl.cp1250.po
+++ b/src/po/pl.cp1250.po
@@ -17,7 +17,7 @@ msgstr ""
 "Language-Team: Polish\n"
 "Language: pl\n"
 "MIME-Version: 1.0\n"
-"Content-Type: text/plain; charset=cp1250\n"
+"Content-Type: text/plain; charset=CP1250\n"
 "Content-Transfer-Encoding: 8bit\n"
 "X-Generator: Lokalize 1.0\n"
 "Plural-Forms: nplurals=3; plural=(n==1 ? 0 : n%10>=2 && n%10<=4 && (n%100<10 "
diff --git a/src/po/zh_CN.cp936.po b/src/po/zh_CN.cp936.po
index 1498778102..89b4bfc61c 100644
--- a/src/po/zh_CN.cp936.po
+++ b/src/po/zh_CN.cp936.po
@@ -23,7 +23,7 @@ msgstr ""
 "Language-Team: Simplified Chinese\n"
 "Language: \n"
 "MIME-Version: 1.0\n"
-"Content-Type: text/plain; charset=gbk\n"
+"Content-Type: text/plain; charset=GBK\n"
 "Content-Transfer-Encoding: 8bit\n"
 "Plural-Forms: nplurals=1; plural=0;\n"
 
diff --git a/src/po/zh_CN.po b/src/po/zh_CN.po
index a003c1455f..8e4571d38e 100644
--- a/src/po/zh_CN.po
+++ b/src/po/zh_CN.po
@@ -23,7 +23,7 @@ msgstr ""
 "Language-Team: Simplified Chinese\n"
 "Language: \n"
 "MIME-Version: 1.0\n"
-"Content-Type: text/plain; charset=gb2312\n"
+"Content-Type: text/plain; charset=GB2312\n"
 "Content-Transfer-Encoding: 8bit\n"
 "Plural-Forms: nplurals=1; plural=0;\n"