Implement auto-save

mods/common/fluent/chrome.ftl

@@ -473,6 +473,11 @@ label-audio-device-container = Audio Device:
 label-video-volume-container = Video Volume:
 label-restart-required-container-audio-desc = Device changes will be applied after the game is restarted
 
+## settings-gameplay.yaml
+label-game-play-section-header = Auto-save
+auto-save-interval-label = Auto-save frequency:
+auto-save-nr-label = Auto-save limit:
+
 ## settings-display.yaml
 label-target-lines-dropdown-container = Target Lines:
 label-status-bar-dropdown-container-bars = Status Bars:

mods/common/fluent/common.ftl

@@ -408,6 +408,22 @@ label-original-notice = The default is "{ $key }"
 label-duplicate-notice = This is already used for "{ $key }" in the { $context } context
 hotkey-context-any = Any
 
+## GameplaySettingsLogic
+auto-save-interval =
+    .disabled = Disabled
+    .options =
+        { $seconds ->
+            [one] 1 second
+           *[other] { $seconds } seconds
+        }
+    .minute-options =
+        { $minutes ->
+            [one] 1 minute
+           *[other] { $minutes } minutes
+        }
+
+auto-save-max-file-number = { $saves } saves
+
 ## InputSettingsLogic
 options-mouse-scroll-type =
     .disabled = Disabled