In the Contributors page you can find all the stats for each contributor assigned the localization projects you host on your account/organization, or of which you are an admin.
In each contributor stats page, you can see the total number of words, characters and translations a contributor added to all the projects they're assigned to. You can also see how many words or characters the contributor translated from the source language.
To access the translation stats for a contributor, click on All Stats next to the name of the contributor.
Then choose the period you are interested in using the Date Range Picker. By default, the Date Range Picker is set to show the activity done in the last week.
You can see the language(s) in which the user added translations, the number of translated strings (Translations) and how many words and characters these strings represent (Words, Chars). Reference Words (Ref. Words) and Reference Chars (Ref. Chars) are also available - these are the words in the terms or the words in the Reference Language (source language), if one is set, that the contributor translated.
If you want, you can filter the stats for a single project, or to see the numbers for all the project(s) in which the contributor added translations.
To see the translation stats for a project for all contributors, see the project Stats page.