Make free coaching call url configurable and popup translatable #1631

Job	Run time
build_and_test (3.9, 18.x, :lint:python:client:common:smoke:)	3m 59s
build_and_test (3.9, 18.x, :server-1-of-2:)	11m 59s
build_and_test (3.9, 18.x, :server-2-of-2:)	11m 17s
build_and_test (3.9, 18.x, :nbrowser-^[A-G]:)	9m 52s
build_and_test (3.9, 18.x, :nbrowser-^[H-L]:)	3m 51s
build_and_test (3.9, 18.x, :nbrowser-^[M-O]:)	11m 16s
build_and_test (3.9, 18.x, :nbrowser-^[P-S]:)	5m 59s
build_and_test (3.9, 18.x, :nbrowser-^[^A-S]:)	4m 30s
build_and_test (:lint:python:client:common:smoke:, 18.x, 3.10)	4m 6s
build_and_test (:lint:python:client:common:smoke:, 18.x, 3.11)	4m 0s
candidate	0s
	1h 10m 49s

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