[Patch] Detect preset wiki languages automatically

[simon04]

Instead of maintaining various OSM wiki languages in defaultpresets.xml, maintaining presets_lang.pl, running presets_lang.pl from time to time, still applying manual changes (cf. #17171), let JOSM detect the wiki language automatically. This features has been implemented long ago in HelpAction.displayHelp: it opens https://wiki.openstreetmap.org/wiki/[lang]:[page] if it exists and falls back to https://wiki.openstreetmap.org/wiki/[page].

So in a nutshell …

data/defaultpresets.xml

@@ -326 +326 @@
         <reference ref="voltage_frequency" />
     </chunk>
     <chunk id="power_generator">
-        <link href="https://wiki.openstreetmap.org/wiki/Tag:power=generator"
-                  cs.href="https://wiki.openstreetmap.org/wiki/Cs:Tag:power=generator"
-                  de.href="https://wiki.openstreetmap.org/wiki/DE:Tag:power=generator"
-                  es.href="https://wiki.openstreetmap.org/wiki/ES:Tag:power=generator"
-                  fr.href="https://wiki.openstreetmap.org/wiki/FR:Tag:power=generator"
-                  it.href="https://wiki.openstreetmap.org/wiki/IT:Tag:power=generator"
-                  ja.href="https://wiki.openstreetmap.org/wiki/JA:Tag:power=generator"
-                  pl.href="https://wiki.openstreetmap.org/wiki/Pl:Tag:power=generator"
-                  pt.href="https://wiki.openstreetmap.org/wiki/Pt:Tag:power=generator"
-                  ru.href="https://wiki.openstreetmap.org/wiki/RU:Tag:power=generator" />
+        <link wiki="Tag:power=generator" />
         <space />
         <key key="power" value="generator" />
         <reference ref="name_ref_operator" />

In total: 719 insertions(+), 5651 deletions(-)