Centralize abbreviations

We should keep abbreviations in a header and turn instances such as `tr( "Amt" )` into `ABBR( Amount )`. The header would look like:

``` c++
#define ABBR_Amount "AMT"
#define ABBR( str ) tr( ABBR_ ## str )
```

Search the C++ sources for abbreviation translations such as `tr( "Amt" )` and determine which header should contain the shared definitions. Centralize the abbreviations using the proposed `ABBR_...` and `ABBR(...)` pattern, then verify that the affected instances use the centralized names.

Written by the indexing model from the issue text.