Comment 2 for bug 806805

By doin a small find with grep i could tell the that sentence is mentioned in 3 files, and it's spelled correctly on all 3

./build/scripts-2.7/lernid: line 145:
Statusbar.push_message(_('Select the Session tab to see classroom learning material'), duration=20)

./bin/lernid: line145:
Statusbar.push_message(_('Select the Session tab to see classroom learning material'), duration=20)

./po/lernid.pot: line158:
msgid "Select the Session tab to see classroom learning material"