XFire: use constant for plugin title

git-svn-id: http://svn.miranda-ng.org/main/trunk@7784 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
translation fix

git-svn-id: http://svn.miranda-ng.org/main/trunk@7785 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
- langpacks/english: update;
- langpacks/russian: update;


git-svn-id: http://svn.miranda-ng.org/main/trunk@7786 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c