Update i18n.md

Fix a link being inside backticks, which broke the formatting.
Merge pull request #3171 from ss23/patch-4

Update i18n.md
Update datamodel.md

Fix broken link to SS_List->column
Merge pull request #3172 from stevie-mayhew/patch-1

Update datamodel.md
Update i18n.php

Norwegian should use 'nb' and not 'no' in common languages array
Merge pull request #3231 from tscole/patch-2

Update i18n.php