string changes: gksu

[Sebastian Heinlein]

Dear translators and docu people,

we did some changes on the wording of the gksu dialog. gksu is a su/sudo
frontend that is used to get root permissions in a graphical desktop
environment. 

By the way you have to translate libgksu1.2, libgksuui1.0-1 and gksu to
get a completely translated gksu dialog.

Changed message ids in gksu:

"<b><big>Enter the administrative password</big></b>\n"
"\n"
"The application '%s' lets you modify essential parts of your system."

---

"<b><big>Enter your password to run the application \"%s\" as user "
"%s</big></b>"

---

"<b><big>Enter your password to perform administrative
tasks</big></b>\n"
"\n"
"The application '%s' lets you modify essential parts of your system."

---

"<b><big>Enter the password of %s to run the application \"%s
\"</big></b>"

---

"<b><big>Enter your password to perform administrative
tasks</big></b>\n"
"\n"
"%s lets you modify essential parts of your system."

---

"<b><big>Enter your password to run %s as user %s</big></b>"

---

"<b><big>Enter the administrative password</big></b>\n"
"\n"
"%s lets you modify essential parts of your system."

---

"<b><big>Enter the password of %s to run %s</big></b>"

---

"Starting Administrative Application"