Update french translation, changelog; add roger niesten to contributors file

THANKS.in

@@ -324,6 +324,7 @@ Robert Dale
 Roberto Greiner
 Robin Sonefors
 Rodger Allen
+Roger Niesten
 Rok Debevc
 Roman Fiedler
 Ronald Tin

po/fr.po

@@ -578,7 +578,7 @@ msgstr ""
 
 #: plugins/check_disk.c:957
 msgid "Choose bytes, kB, MB, GB, TB, KiB, MiB, GiB, TiB (default: MiB)"
-msgstr "Choisissez octets, kb, MB, GB, TB, KiB, MiB, GiB, TiB (par défaut: MB)"
+msgstr "Choisissez octets, kb, MB, GB, TB, KiB, MiB, GiB, TiB (par défaut: MiB)"
 
 #: plugins/check_disk.c:960
 msgid "Ignore all filesystems of indicated type (may be repeated)"