DOC: Transfer older release and languange Wiki documentation

Transfer Wiki documentation from
https://www.slicer.org/wiki/Documentation/Nightly/FAQ/General#Where_can_I_download_Slicer.3F

about installing older releases and languages.

download.markdown

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+
+        <div id="access-older-releases">
+            You can also get older releases by using the offset parameter in the download page. For example, download page from 7 days ago: http://download.slicer.org/?offset=-7
+
+            To get a direct download link of previous revision on a selected operating system: http://download.slicer.org/download?os=macosx&stability=any&offset=-1
+
+            Always include these parameters:
+
+            stability, which can be release, nightly, or any
+            os, which can be win, macosx, or linux
+            Additional options:
+
+            revision built before or on the date: date=2015-01-01
+            same but checkout date: checkout-date=2015-02-01
+            exact revision: revision=27000
+            revision less than of equal: closest-revision=26000
+            latest revision of 4.3 branch, can include patch as well: version=4.3
+            Any of these queries can be combined with the offset param, which will step forward or backward a given number of revisions. So, stability=release&version=4.5.0&offset=-1 should give you the revision just before the first 4.5 release.
+
+            Where can I download older release of Slicer ?
+            Older releases of 3DSlicer are available here: https://slicer-packages.kitware.com/#collection/5f4474d0e1d8c75dfc70547e/folder/5f4474d0e1d8c75dfc705482
+
+            Extensions can be downloaded for old Slicer releases manually from the Extensions Catalog at the URL: https://extensions.slicer.org/catalog/All/(revision_number)/(operating_system). Revision number is available in Slicer menu: Help / About Slicer (or in the Slicer Releases page). Operating system can be: win, linux, or macosx. For example for Slicer-4.8.0 on Windows extensions are available at: https://extensions.slicer.org/catalog/All/26489/win
+        </div>
+
+        <div id="languages">
+
+            Does Slicer work for non-English computing?
+            At this point no, Slicer uses US English conventions. Specifically this means that directory paths should use ASCII characters only.
+
+            There has been some discussion and planning about internationalization but it is not yet available:
+
+            https://www.slicer.org/wiki/Documentation/Labs/I18N
+            https://discourse.slicer.org/t/slicer-internationalization/579
+        </div>
     </div>
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