Add the missing ManageCredentials translation and correct GlobalCredentials translation (#160)

Author: yuezhuangshi

plugins/credentials-plugin/src/main/resources/com/cloudbees/plugins/credentials/Messages_zh_CN.properties

@@ -42,7 +42,7 @@ SystemCredentialsProvider.ProviderImpl.DisplayName=Jenkins \u51ED\u636E\u63D0\u4
 SystemCredentialsProvider.UserFacingAction.DisplayName=\u7CFB\u7EDF
 UserCredentialsProvider_DisplayName=\u51ED\u636E
 UserCredentialsProvider.UserFacingAction.DisplayName=\u7528\u6237
-GlobalCredentialsConfiguration.DisplayName=\u51ED\u636E\u914D\u7F6E
+GlobalCredentialsConfiguration.DisplayName=\u51ed\u636e\u63d0\u4f9b\u8005\u914d\u7f6e
 GlobalCredentialsConfiguration.Description=\u914D\u7F6E\u51ED\u636E\u7684\u63D0\u4F9B\u8005\u548C\u7C7B\u578B
 CredentialsProviderFilter.None.DisplayName=\u6240\u6709\u53EF\u89C1
 CredentialsProviderFilter.Includes.DisplayName=\u5305\u62EC\u9009\u62E9
@@ -52,3 +52,6 @@ CredentialsTypeFilter.Includes.DisplayName=\u5305\u62EC\u9009\u62E9
 CredentialsTypeFilter.Excludes.DisplayName=\u6392\u9664\u9009\u62E9
 CredentialsProviderTypeRestriction.Includes.DisplayName=\u5305\u62EC
 CredentialsProviderTypeRestriction.Excludes.DisplayName=\u6392\u9664
+
+ManageCredentialsConfiguration.displayName=\u51ed\u636e\u7ba1\u7406
+ManageCredentialsConfiguration.description=\u914d\u7f6e\u51ed\u636e