Update get_formatted_playtime() to use the same localized strings as parse_playtime()

This way the parse/format roundtrip will not be broken by translators getting creative, or forgetting some of the strings.

This does mean we'll lose the translations for playtimes in the next release. I'd hand-fix this, but @strcore has told me not to do this.

lutris/util/strings.py

@@ -165,20 +165,12 @@ def get_formatted_playtime(playtime: float) -> str:
         return NO_PLAYTIME
 
     hours = math.floor(playtime)
-    if hours == 1:
-        hours_text = _("1 hour")
-    elif hours > 1:
-        hours_text = _("%d hours") % hours
-    else:
-        hours_text = ""
+    hours_unit = _("hour") if hours == 1 else _("hours")
+    hours_text = f"{hours} {hours_unit}" if hours > 0 else ""
 
     minutes = int(round((playtime - hours) * 60, 0))
-    if minutes == 1:
-        minutes_text = _("1 minute")
-    elif minutes > 1:
-        minutes_text = _("%d minutes") % minutes
-    else:
-        minutes_text = ""
+    minutes_unit = _("minute") if minutes == 1 else _("minutes")
+    minutes_text = f"{minutes} {minutes_unit}" if minutes > 0 else ""
 
     formatted_time = " ".join([text for text in (hours_text, minutes_text) if text])
     if formatted_time:
@@ -197,6 +189,8 @@ def parse_playtime(text: str) -> float:
 
     if NO_PLAYTIME.casefold() == text:
         return 0.0
+
+    # Handle a single number - assumed to be a count of hours
     try:
         return float(text)
     except ValueError:
@@ -223,6 +217,9 @@ def parse_playtime(text: str) -> float:
             return num / 60
         raise ValueError(error_message)
 
+    # Handle the fancy format made of number unit pairts, like
+    # "1 hour 23 minutes" or "2h57m"; we split this up into digit
+    # and non-digit parts.
     parts = [p.strip() for p in re.split('([0-9.,]+)', text) if p and not p.isspace()]
     parts_iter = iter(parts)