Add support for editor-save in SelectSavegameDialog
Change editor gui to use SelectSavegameDialog instead of SaveMapDialog
Make the EditorSession save function also show a dialog to choose the map name.

This is the way the save function in spsession works.
Remove SaveMapDialog, which is now unnecessary
New files added from Unknown Horizons Translation Server based on templates
Commit from Unknown Horizons Translation Server by user Chris Oelmueller.: 0 of 785 strings translated (0 fuzzy).
Check for valid gettext plural forms (#2048)
More helpful logging of errors with translations

Should now actually print errors that happen, and also hint about the
fallback used. #2048
Commit from Unknown Horizons Translation Server by user Gallaecio.: 369 of 369 strings translated (0 fuzzy).
Commit from Unknown Horizons Translation Server by user Gallaecio.: 733 of 733 strings translated (0 fuzzy).
Commit from Unknown Horizons Translation Server by user Gallaecio.: 17 of 17 strings translated (0 fuzzy).
Copy `corn` icon to `grain`

Due to lack of more fitting icons. Fixes #2047
Commit from Unknown Horizons Translation Server by user Gallaecio.: 212 of 212 strings translated (0 fuzzy).
Minor refactoring in Color

Mostly motivated by line length and a plain `except:`.
Player-colored versions of old cityinfo settlement icon

These are not simply recolored but also manually adjusted.
Use player-colored settlement icon in cityinfo

Replaces the old (temporary) player flag that was pretty ugly in the new
configuration.
Also use colored settlement icon in account tab

This is still a hidden button accessing the settlement production
overview, but why not just update to a more advanced placeholder.
Reorder imports
Refactor duplicate code
Move code showing save menu from session to gui