When XCA started in 2002, there were no C++ initializers.
Drop explicit initializers from the constructors.
- Fix indentations of section declarators.
- Replace NULL by nullptr when feasible.
- Sort private section: properties first, then methods.
No need to translate "X Certificate and Key management",
"Form", "Dialog" or "TimeInput"
"Select Token" and "New Key" window titles were never shown.
Remove them.
The DbTransaction class automatically rolls back when the scope
is left (destructor) and no commit happenned.
Every transaction begin will increment the counter,
each commit/rollback will decrement it. Only if all transactions
finished with a commit, a final database commit will be performed.
