I think you can use a switch for the different projects in the template, see for example this Hungarian page:

http://meta.wikimedia.org/wiki/MediaWiki:Centralnotice-2008_nometer_2-donate-text/hu?action=edit

and the switch function inside it:
{{#switch:{{lc:{{SITENAME}}}} |wikiszótár=Wikiszótárra |wikipédia=Wikipédiára |wikihírek=Wikihírekre |wikidézet=Wikidézetekre|wikikönyvek=Wikikönyvekre |wikiforrás=Wikiforrásra |Wikimédiára}}

On the left side of the =-signs is the name of the project in your language with small initial letters, while on the right side is the text that should be shown in the given project. (This might seem complicated, but it isn't that difficult; setting up separate notices for the different languages and then maintaining them when the banner changes might be much more complicated IMHO).

Best,
Regards

On Tue, Nov 11, 2008 at 6:59 PM, Luiz Augusto <lugusto@gmail.com> wrote:

On Tue, Nov 11, 2008 at 7:46 AM, Petr Kadlec <petr.kadlec@gmail.com> wrote:
 
In Czech (cs), you need to take into account the grammatical gender
and number of the names. While "Wikipedie" (Wikipedia) is feminine
singular, "Wikislovník" (Wiktionary) is masculine singular, Wikinews
is plural, etc. But, since all projects share the same central notice
template, and differ only in the language, it is not that easy, I am
afraid.

Same issue with the Portuguese language. "Wikipedia", "Wikinotícias" (Wikinews) and "Wikiversidade" (Wikiversity) are feminine singular. "Wikcionário" (Wiktionary), "Wikilivros" (Wikibooks), "Wikiquote", "Wikisource" and "Wikimedia Commons" masculine singular.

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