Replace plain text in composer template (PR #167)

Replaced some plain text in the composer template with i18n calls.

Hopefully I’ve got this right, it’s my first pull request!

GitHub

oops … I may have merged stuff in the wrong order of PRs :frowning: do you mind getting the PR good to merge again?

OK, I think I’ve done that correctly. I tried squashing the commits too. Let me know if anything is still amiss.

looks fine to me ! thanks