add a missing translation
add a missing translation

refs CNVS-33564

test plan:
- create a new assignment group
- the string "number of scores to ignore for each student" should be
translated

Change-Id: I491e72f315f143550a90e8c3b957d8c6e75532e4
Reviewed-on: https://gerrit.instructure.com/96263
Tested-by: Jenkins
Reviewed-by: Rob Orton <7e09c9d3e96378bf549fc283fd6e1e5b7014cc33@instructure.com>
Product-Review: Rob Orton <7e09c9d3e96378bf549fc283fd6e1e5b7014cc33@instructure.com>
QA-Review: Rob Orton <7e09c9d3e96378bf549fc283fd6e1e5b7014cc33@instructure.com>

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