Street name prefix/suffix plot

[FloEdelmann]

Originally suggested in #44 (comment):

In the new street name page, it could be displayed which street name prefixes/suffixes are most common. A bar plot probably makes most sense, although a map would also be nice. The list to check would need to be hardcoded (just like the categories are):

• "-straße" (currently 131)
• "-weg" (currently 113)
• "-ring" (currently 6)
• "-platz" (currently 5)
• "-anger" (currently 4, including "Am Anger")
• "-hof" (currently 2)
• "-gasse" (currently 1)
• "-allee" (currently 1)
• "-spange" (currently 1)
• "-winkel" (currently 1)
• "Am …" (currently 9)