Initial Finnish translation (#561)

* Add initial Finnish translation (credit: LINUX-SAUNA)
* Improvements by Mikaela (#563)

docs/syncplay.1

@@ -4,7 +4,7 @@
 .\" First parameter, NAME, should be all caps
 .\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
 .\" other parameters are allowed: see man(7), man(1)
-.TH Syncplay 1 "February 7 2021"
+.TH Syncplay 1 "3 November 2022"
 .\" Please adjust this date whenever revising the manpage.
 .\"
 .\" Some roff macros, for reference:
@@ -97,7 +97,7 @@ Path to the player binary.
 
 .TP
 .B \-\-language language
-Language of Syncplay messages. Valid values are de/en/es/eo/fr/it/pt_PT/pt_BR/tr/ru/zh_CN.
+Language of Syncplay messages. Valid values are de/en/es/eo/fi/fr/it/pt_PT/pt_BR/tr/ru/zh_CN.
 
 .TP
 .B \-\-clear\-gui\-data

syncplay/messages.py

@@ -5,6 +5,7 @@
 from . import messages_en
 from . import messages_es
 from . import messages_eo
+from . import messages_fi
 from . import messages_fr
 from . import messages_it
 from . import messages_pt_PT
@@ -20,6 +21,7 @@
     "en": messages_en.en,
     "es": messages_es.es,
     "eo": messages_eo.eo,
+    "fi": messages_fi.fi,
     "fr": messages_fr.fr,
     "it": messages_it.it,
     "pt_PT": messages_pt_PT.pt_PT,