git-contrib: use non-breaking spaces in names

Some people have initials or abbreviated parts in the name and looks strange
when a line break occurs in the middle. Let's keep each name in one line.

tools/git-contrib.sh

@@ -2,6 +2,7 @@
 # SPDX-License-Identifier: LGPL-2.1-or-later
 set -eu
 
-git shortlog --author=noreply@weblate.org --invert-grep -s `git describe --abbrev=0 --match 'v[0-9][0-9][0-9]'`.. | \
-    awk '{ $1=""; print $0 "," }' | \
+tag="$(git describe --abbrev=0 --match 'v[0-9][0-9][0-9]')"
+git log --pretty=tformat:%aN --author=noreply@weblate.org --invert-grep -s "${tag}.." | \
+    sed 's/ / /g; s/--/-/g; s/.*/        \0,/' |
     sort -u