dashboard: Specify context for translation
dashboard: Specify context for translation

This is workaround - see
https://github.com/cockpit-project/cockpit/issues/12840 for more
details.

(I am not specifying this context for other labels, as it would just
 mean that we need to translate those things once more.)

martinpitt/cockpit,martinpitt/cockpit,cockpituous/cockpit,garrett/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,cockpituous/cockpit,mvollmer/cockpit,cockpit-project/cockpit,cockpituous/cockpit,garrett/cockpit,garrett/cockpit,garrett/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,deryni/cockpit,deryni/cockpit,martinpitt/cockpit,deryni/cockpit,mvollmer/cockpit,garrett/cockpit,mvollmer/cockpit,deryni/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,deryni/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,deryni/cockpit,cockpituous/cockpit,cockpituous/cockpit,mvollmer/cockpit,deryni/cockpit