Integration: #2714 Lao date names and drop the stray Preferences... key

DATE_LANGUAGES gains the lo row in the same position as in LANGUAGES, so
date_languages_are_the_interface_languages holds; lo.tsv loses a key that
matches no English source.

crates/engine/src/dates.rs

@@ -59,7 +59,7 @@ const AR_DAYS: [&str; 7] = ["الأحد", "الاثنين", "الثلاثاء",
 
 /// The languages month and weekday names can be written in (Preferences ▸ Date format ▸ Language):
 /// the interface languages, in the same order and with the same names.
-pub static DATE_LANGUAGES: [DateLanguage; 28] = [
+pub static DATE_LANGUAGES: [DateLanguage; 29] = [
     DateLanguage {
         code: "en",
         name: "English",
@@ -501,6 +501,15 @@ pub static DATE_LANGUAGES: [DateLanguage; 28] = [
         days: ["duminică", "luni", "marți", "miercuri", "joi", "vineri", "sâmbătă"],
         days_short: ["dum.", "lun.", "mar.", "mie.", "joi", "vin.", "sâm."],
     },
+    DateLanguage {
+        code: "lo",
+        name: "ພາສາລາວ",
+        months: ["ມັງກອນ", "ກຸມພາ", "ມີນາ", "ເມສາ", "ພຶດສະພາ", "ມິຖຸນາ", "ກໍລະກົດ", "ສິງຫາ", "ກັນຍາ", "ຕຸລາ", "ພະຈິກ", "ທັນວາ"],
+        months_with_day: None,
+        months_short: ["ມ.ກ.", "ກ.ພ.", "ມ.ນ.", "ມ.ສ.", "ພ.ພ.", "ມິ.ຖ.", "ກ.ລ.", "ສ.ຫ.", "ກ.ຍ.", "ຕ.ລ.", "ພ.ຈ.", "ທ.ວ."],
+        days: ["ວັນອາທິດ", "ວັນຈັນ", "ວັນອັງຄານ", "ວັນພຸດ", "ວັນພະຫັດ", "ວັນສຸກ", "ວັນເສົາ"],
+        days_short: ["ອາທິດ", "ຈັນ", "ອັງຄານ", "ພຸດ", "ພະຫັດ", "ສຸກ", "ເສົາ"],
+    },
 ];
 
 /// The date language for `code` (any case), or `None` when there's none.

crates/ui-egui/src/i18n/lo.tsv

@@ -22,7 +22,6 @@
 	View	ມຸມມອງ
 	Help	ຊ່ວຍເຫຼືອ
 	Preferences	ການຕັ້ງຄ່າ
-	Preferences...	ການຕັ້ງຄ່າ...
 	Interface language	ພາສາສະແດງຜົນ
 	Interface size	ຂະໜາດອິນເຕີເຟສ
 	Auto ({percent}%)	ອັດຕະໂນມັດ ({percent}%)