Add simplified Chinese language translations (#3784)

data/conf/dovecot/dovecot.conf

@@ -130,6 +130,15 @@ namespace inbox {
   mailbox "Verwijderde items" {
     special_use = \Trash
   }
+  mailbox "废件箱" {
+    special_use = \Trash
+  }
+  mailbox "已删除消息" {
+    special_use = \Trash
+  }
+  mailbox "已删除邮件" {
+    special_use = \Trash
+  }
   mailbox "Archive" {
     auto = subscribe
     special_use = \Archive
@@ -155,6 +164,9 @@ namespace inbox {
   mailbox "Archivovať" {
     special_use = \Archive
   }
+  mailbox "归档" {
+    special_use = \Archive
+  }
   mailbox "Sent" {
     auto = subscribe
     special_use = \Sent
@@ -165,6 +177,15 @@ namespace inbox {
   mailbox "Sent Items" {
     special_use = \Sent
   }
+  mailbox "已发送" {
+    special_use = \Sent
+  }
+  mailbox "已发送消息" {
+    special_use = \Sent
+  }
+  mailbox "已发送邮件" {
+    special_use = \Sent
+  }
   mailbox "Gesendet" {
     special_use = \Sent
   }
@@ -208,6 +229,12 @@ namespace inbox {
   mailbox "Koncepty" {
     special_use = \Drafts
   }
+  mailbox "草稿" {
+    special_use = \Drafts
+  }
+  mailbox "草稿箱" {
+    special_use = \Drafts
+  }
   mailbox "Junk" {
     auto = subscribe
     special_use = \Junk
@@ -233,6 +260,12 @@ namespace inbox {
   mailbox "Ongewenste e-mail" {
     special_use = \Junk
   }
+  mailbox "垃圾" {
+    special_use = \Junk
+  }
+  mailbox "垃圾箱" {
+    special_use = \Junk
+  }
   mailbox "Koncepty" {
     special_use = \Drafts
   }

data/web/inc/vars.inc.php

@@ -78,7 +78,7 @@ $DETECT_LANGUAGE = true;
 $DEFAULT_LANG = 'en';
 
 // Available languages
-$AVAILABLE_LANGUAGES = array('ca', 'cs', 'de', 'en', 'es', 'fi', 'fr', 'it', 'lv', 'nl', 'pl', 'pt', 'ro', 'ru', 'sk', 'sv');
+$AVAILABLE_LANGUAGES = array('ca', 'cs', 'de', 'en', 'es', 'fi', 'fr', 'it', 'lv', 'nl', 'pl', 'pt', 'ro', 'ru', 'sk', 'sv', 'zh');
 
 // Change theme (default: lumen)
 // Needs to be one of those: cerulean, cosmo, cyborg, darkly, flatly, journal, lumen, paper, readable, sandstone,