Add a table for language formality

In the formality section of the translation page, make it easy to
see the formality expectations of each language by listing each
language in a table, with their formality levels and an explanation.

doc/development/i18n/translation.md

@@ -61,8 +61,12 @@ This helps maintain a logical connection and consistency between tools (e.g.
 
 ### Formality
 
-The level of formality used in software varies by language.
-For example, in French we translate `you` as the formal `vous`.
+The level of formality used in software varies by language:
+
+| Language | Formality | Example |
+| -------- | --------- | ------- |
+| French | formal | `vous` for `you` |
+| German | informal | `du` for `you` |
 
 You can refer to other translated strings and notes in the glossary to assist
 determining a suitable level of formality.