Add Spanish support

From unmerged PR on parent repo:
Ballasi#29

Author: bd-g

README.md

@@ -83,6 +83,7 @@ Here is a list of all of the supported languages:
 | 🇫🇷🇨🇦 | `Lang::French`    | `fr`      | French      | quarante-deux |
 | 🇧🇪🇨🇩 | `Lang::French_BE` | `fr_BE`   | French (BE) | quarante-deux |
 | 🇨🇭   | `Lang::French_CH` | `fr_CH`   | French (CH) | quarante-deux |
+| 🇪🇸   | `Lang::Spanish`   | `es`      | Spanish     | cuarenta y dos|
 | 🇺🇦   | `Lang::Ukrainian` | `uk`      | Ukrainian   | сорок два     |
 
 This list can be expanded! Contributions are welcomed.

src/bin/bin.rs

@@ -25,6 +25,7 @@ AVAILABLE LANGUAGES:
     fr:      French (France and Canada)
     fr_BE:   French (Belgium and the Democratic Republic of the Congo)
     fr_CH:   French (Swiss Confederation and Aosta Valley)
+    es:      Spanish
     uk:      Ukrainian
 
 AVAILABLE OUTPUTS: