misc: unify terminology

8+3 filename → 8.3 filename
be ware → beware
{cannot, can not, cant, can't, could not, couldn't} → unable to
conpleted → completed
file name → filename
imcomplete → incomplete
informations → information
trying to → attempting to
wrong password → incorrect password

GitLab: jami-client-qt#1730

Change-Id: Ia7757efafd2c06af978db02c65b40b1b77c393f8