[Backend] Improve projects-edit lambda
[Backend] Improve projects-edit lambda

Merge sequences while append pending change. Following pending changes :
- { oldString: 'test', newString: 'test-1' }
- { oldString: 'test-1', newString: 'test-2' }
will result in one single change : { oldString: 'test', newString: 'test-2' }

yllieth/localehub,yllieth/localehub,yllieth/localehub,yllieth/localehub