Shortcuts in dict_od_tables and as prefix for attribute-names in views

[urskaufmann]

Describe the bug
In two cases we have different shortcuts for tables in dict_od_tables and in the vw_tww-tables:
For channel is "CL" in dictionary, but "ch" in your views (was already in QGEP like this).
For biol_eco_assessment is "BO" in the dictionary, but "ba" in your views.

Suggestion: Change the english shortcuts in the dict_od_tables to CH and BA instead of CL and BO.