bbb-lti updated in preparation for the 0.81-beta1 release

[x]Views now are localized
[x]Added sp and fr translations
[x]Updated icons. icon.ico(16x16) icon.gif(24x24)
[x]Parameter custom_bbb_record is now custom_bbb_recording
[x]Removed not required files
[x]Changed behavior of extended mode. Users join directly if the recording is mot enabled for the launch.