feat: set alts_enabled for model

src/models/settings.ini

@@ -13,16 +13,18 @@ enabled = no
 [fields.measures]
 label = Measures
 description = Space separated list
-width = 3/5
 type = text
 default = kg g L dl cl ml oz lb pt qt cm tsp tbsp c cup cups pkg pck
-
-[fields.replace_frac]
-label = Replace 1/2 with ½, ⅔, et.c
-width = 1/5
-type = boolean
+alts_enabled = true
 
 [fields.replace_temp]
 label = Replace °C/°F with ℃/℉
 width = 1/5
 type = boolean
+alts_enabled = false
+
+[fields.replace_frac]
+label = Replace 1/2 with ½, ⅔, etc.
+width = 1/5
+type = boolean
+alts_enabled = false