Vol 52 vj818xc6811: correct sessoion to session in attrib
Vol 49: vx924bt2426: correct aplha to alpha in div3 attrib
Vol 25: dh941mm7815: correct ohter to other in div3 attrib
correct date attib (was in European style)
correct date attrib typo
dh941mm7815: add missing date tag to session
qr254wd8880: add missing date tags to sessions
vj818xc6811: add and correct date tags for sessions