Completes the Turkish translation of six more modules and removes their
machine-generated lang/tr.auto files:
cluster-useradmin 154 strings - users and groups across servers
net 146 new strings - IPv6, bridges, bonding, VLANs
pptp-server 141 strings - PoPToP PPTP VPN server
format 141 strings - Solaris disk partitioning
filter 131 strings - Usermin mail filtering and autoreply
fetchmail 130 strings - Fetchmail mail retrieval
net already had a partial lang/tr; the 196 existing strings were kept
and only the untranslated remainder was added.
Interface and driver terminology that appears verbatim in configuration
files (Netplan, dhcpcd, Network Manager, miimon, updelay, downdelay,
balance-tlb, balance-alb, VLAN, PPP, PAP, CHAP, MS-CHAP, MPPE, PTY,
UFS, INBOX, procmail) is kept in English.