Add note to Sprint Guide, update .po file sort order. (#646)

Author: kattni

BeeWare.lektorproject

@@ -83,7 +83,7 @@ locale = fa_IR
 lektor-github-repos = 0.1.1
 lektor-gravatar = 0.1.3
 lektor-markdown-admonition = 0.3.1
-git+https://github.com/beeware/lektor-i18n-plugin@v0.5.1 =
+git+https://github.com/beeware/lektor-i18n-plugin@v0.5.2 =
 
 [servers.ghpages]
 target = ghpages://beeware/beeware.github.io?cname=beeware.org

content/contributing/sprint-guide/contents.lr

@@ -205,6 +205,18 @@ get you unstuck. If you're confused, it's because the topic is
 complicated, and we haven't explained it well enough. We're eager to
 help - and we want to make sure you have a successful sprint.
 
+### What if I don't complete my contribution during the sprint?
+
+No problem! You can submit a contribution at any time. A goal of the
+sprints is to encourage and empower you to continue contributing
+throughout the rest of the year. The Bee Team are available to help
+with any part of this process.
+
+If you were already working on a GitHub issue or submitted a PR, you
+can continue to communicate through GitHub. If you have other
+questions or need real-time help, the best place to find us is the
+[BeeWare Discord server](https://beeware.org/bee/chat/). We're looking
+forward to continuing to work with you!
 ---
 gutter:
 
@@ -225,4 +237,4 @@ problem with this Sprint Guide counts as a contribution to BeeWare!
 ---
 summary: How to sprint with the BeeWare team
 ---
-sort_key:
+sort_key: