Some corrections to interwiki_local_x_intro messages

Fixing Interwiki_local_0_intro and Interwiki_local_1_intro to reflect the actual behavior

Discussed here: [1]

[1] https://translatewiki.net/wiki/Thread:Support/About_MediaWiki:Interwiki_local_0_intro_and_MediaWiki:Interwiki_local_1_intro

Change-Id: If4797232a627938d788ba7f0fe5d226452c9799b
Merge "Some corrections to interwiki_local_x_intro messages"