Fix stragglers that were not properly renamed in the XDG standardization commits

tdecert/tdecertpart.desktop

@@ -83,7 +83,7 @@ Comment[zh_HK]=可嵌入的個人證書管理工具
 Comment[zh_TW]=可嵌入的個人認證管理工具
 Comment[zu]=Imeneja Yesitifiketi Sobunini Oshuthekiwe
 MimeType=application/x-pkcs12;application/x-x509-ca-cert;application/binary-certificate;
-Icon=lock
+Icon=system-lock-screen
 Name=KCertPart
 Name[af]=Kcertpart
 Name[bn]=কে-সার্ট-পার্ট

tdeio/misc/tdemailservice.protocol

@@ -10,6 +10,6 @@ writing=false
 makedir=false
 deleting=false
 DocPath=tdeioslave/mailto/index.html
-Icon=mail_new
+Icon=mail-message-new
 Class=:internet
 URIMode=mailto

tdeprint/specials.desktop

@@ -251,7 +251,7 @@ Comment[zh_CN]=本地文件
 Comment[zh_HK]=本地檔案
 Comment[zh_TW]=本地檔案
 Comment[zu]=Ifayela laseduze
-Icon=filesave
+Icon=document-save
 Command=
 File=1
 Extension=ps