The `lupdate` tool from Qt used to extract translations from files was
not in sync with what the macros defined in the code. The mismatch came
from two places:
1. The DrawSketchHandeler used non fully-qualified name for the
context whereas lupdate assumed the FQN.
2. Deriving DrawSketchHandlers did not override the translate method
context to their own class names while lupdate assumed that they do.
While it's not fully clear if what `lupdate` does here is correct
(it's a lot of assumptions) it's way easier to fix our metadata than
fight with lupdate.
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