webui: change the run calculation button label
webui: change the run calculation button label

Former-commit-id: a680a7eb1fe6b2c423322951a4877eddd343145d [formerly a680a7eb1fe6b2c423322951a4877eddd343145d [formerly 716ecd9e6095fde6ac26fa0176d46b92ca33d14f]]
Former-commit-id: 7a49ef7b31444f34cf241013460e2209bf29ccca
Former-commit-id: b1207d01fbbf109c55d63514920ed3ca12884c9c
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine