Load avatar of affected teachers

See merge request !392

Resolve "Adapt to active school term"

Closes #260

See merge request !380

Merge branch '263-loading-animation-for-timetable-object-select-on-left-side-of-timetables' into 'master'

Resolve "Loading animation for timetable object select on left side of timetables"

Closes #263

See merge request !393

Resolve "Jump to first lesson instead of current time in timetables"

Closes #273

See merge request !390

Fix change detection in automatic plan

See merge request !391

Resolve "Make substitutions table more compact"

Closes #271

See merge request !389

Resolve "Don't show monday on sundays"

Closes #272

See merge request !388

Fix empty querysets

See merge request !387

Resolve "Permissions for timetables are not checked properly"

Closes #251

See merge request !369

Resolve "Hide days"

Closes #264

See merge request !385

Resolve "Make group/teacher/rooms buttons a toggle"

Closes #265

See merge request !386

Resolve "Add mascot"

Closes #262

See merge request !383