In tortoiseSvn 1.8 there is no \"reintegrate\" a branch option. What is the right way to reintegrate a branch in Tortoise Svn 1.8?
In choose merge and then next opti
Just merge branch to any TARGET
Edit
OK, extended answer: "Merge for Dummies" in pictures
Preface
OK, I will not mask or hide used proving ground.
Used in this sample resources:

z:\WC-Trunk (WC of trunk, used in process)Steps to reproduce
In order to merge branch to trunk, I have to have Working Copy of trunk, thus - trunk's HEAD checkouted to WC-Trunk
z:\WC-Trunk>svn ls
Dr?p?r.ma?ar.sv?nskan.man.eller.smalensk?n.txt
Hello.de.txt
Hello.en.txt
Hello.eo.txt
Hello.fr.txt
it's needed WC
z:\WC-Trunk>svn info
Path: .
Working Copy Root Path: Z:\WC-Trunk
URL: http://mayorat.ursinecorner.ru:8088/svn/Hello/trunk
Relative URL: ^/trunk
...
Start merging

Select "Merge range", because "This method covers the case when you have made one or more revisions to a branch (or to the trunk) and you want to port those changes across to a different branch"

Select all revisions, if otherwise not defined and path to tree in repository, which have to be merged to trunk (our French branch)

Define (if needed) some additional merge options, can test merge in order to detect, will be conflict resolution needed in any form, or just start real merge process at last
