Show additions and deletions

[lhsazevedo]

Intro

If accepted, this PR will add additions and deletions counts to the outdated files table. This helps translators coordinate efforts and choose a file according to the time they have available. The change counts are displayed in the standard +42 -42 format.

Preview

"Crowded" Table

I am aware that this change further increases the amount of information in the table, which is already very polluted.
I have a proposal to address this issue, however I have not included here initially, as it is outside the scope of this PR.

• Lighten table stripes (only affects file rows, directory rows doesn't change)
• Remove underline from links (this table only)
• Left align file names, so our eyes are able to scan the list faster.
• Display a truncated version of the hash with 7 characters. We can move the full hashes to the file diff page, as we are usually at it when we want to copy the new revision hash.

Please let me know if you would like me to include improved table styles in this Pull Request. Preview: