update links to syndie to point to its eepsite
remove #i2p-help from the router console (merged into #i2p)
router console: s;forum\.i2p2\.de;forum.i2p;g
router console: fix links to i2p project pages

Some pages, such as Arabic linked to the German version.
Most pages mentioned "i2p-projekt and its mirror i2p-projekt.i2p"
s/i2plugins/plugins/ since i2plugins hasn't existed for years