Fix basket check id and translation

[Chadys]

Fixed a bug about a basket warning message that couldn't be discovered by makemessage as well as fixed the makemessages command in the makefile.
Prevent some access to db properties of the basket when the object is not yet saved and added some test for it

[codecov]

Codecov Report

Merging #4283 (509d068) into master (204b9a7) will decrease coverage by 0.01%.
Report is 11 commits behind head on master.
The diff coverage is 90.90%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4283      +/-   ##
==========================================
- Coverage   88.28%   88.27%   -0.01%     
==========================================
  Files         293      293              
  Lines       16046    15914     -132     
==========================================
- Hits        14166    14048     -118     
+ Misses       1880     1866      -14     

Files	Coverage Δ
src/oscar/apps/basket/abstract_models.py	91.49% <90.90%> (-0.18%)	⬇️

... and 185 files with indirect coverage changes