Add Ukrainian language (#712)

* Add Ukrainian flag and set font
* Minor fixes to the English text
* Add Ukrainian localization
* Reorder flags, replace "jigo (draw)" with "jigo"
* Shorten translation of winrate to make icon fit

katrain/core/lang.py

@@ -11,7 +11,7 @@
 class Lang(Observable):
     observers = []
     callbacks = []
-    FONTS = {"jp": "NotoSansJP-Regular.otf", "tr": "NotoSans-Regular.ttf"}
+    FONTS = {"jp": "NotoSansJP-Regular.otf", "tr": "NotoSans-Regular.ttf", "ua": "NotoSans-Regular.ttf"}
 
     def __init__(self, lang):
         super(Lang, self).__init__()

katrain/gui.kv

@@ -1069,6 +1069,9 @@
         LangButton:
             icon: 'flags/flag-fr.png'
             on_press: app.language = 'fr'
+        LangButton:
+            icon: 'flags/flag-ua.png'
+            on_press: app.language = 'ua'
 #        LangButton:
 #            icon: 'flags/flag-es.png'
 #            on_press: app.language = 'es'

katrain/i18n/locales/en/LC_MESSAGES/katrain.po

@@ -765,7 +765,7 @@ msgstr "KataGo"
 
 msgid "aihelp:default"
 msgstr ""
-"Full strength KataGo AI. Strength is  affected by 'max visits' and 'model' "
+"Full strength KataGo AI. Strength is affected by 'max visits' and 'model' "
 "in the general settings 'engine' section and engine configuration file. No "
 "options are available here."
 
@@ -920,7 +920,7 @@ msgstr "{num} available katago versions found"
 msgid "All models downloaded"
 msgstr "All available models already downloaded"
 
-#. error message on trying to download models when already done
+#. error message on trying to download katago when already done
 msgid "All binaries downloaded"
 msgstr "All available binaries already downloaded"