Make internal link work for translated content (#647)

- Adds an anchor to Reproducible Installs section of
install.md so internal link will still work when
header is translated to a new language.

Author: steppi

content/en/install.md

@@ -129,6 +129,7 @@ The third difference is that conda is an integrated solution for managing
 packages, dependencies and environments, while with pip you may need another
 tool (there are many!) for dealing with environments or complex dependencies.
 
+<a name="reproducible-installs"></a>
 
 ### Reproducible installs