Translate the clock-setting screens' day names and time-of-day word

DAYS (SUNDAY..SATURDAY), the MORN/DAY/NITE word PrintHour prints, and the
"o'clock"/"min." suffixes bypassed src/core/Strings.lua entirely -- they
were plain Lua literals with no lookup, so a translation mod's `strings`
registry had nothing to catch and Oak's clock screens, the day-of-week
wheel, the main menu clock box and the Pokegear's clock card kept printing
English regardless of the loaded language (reported from a real Spanish
Gold build).

Both live in src/core/gen2/Clock.lua, which already owns weekday/hour
arithmetic and is already required by InitClock.lua, MainMenu.lua and
Pokegear.lua: Clock.DAY_NAMES + Clock.weekdayName(day) is the one place the
three screens read a weekday's name from, so a fix to it cannot land on one
screen and silently miss the other two. Clock.daytimeLabel(hour) is the
translated counterpart to Palettes.clockDaytime, which keeps answering the
untranslated MORN/DAY/NITE key every FORCED_DAYTIME lookup in Palettes.lua
compares against -- src/world/gen2/Palettes.lua itself is untouched, so
that module stays pure table/color math with no Strings coupling.

src/core/gen2/Clock.lua

@@ -16,13 +16,56 @@
 -- it (src/ui/gen2/InitClock.lua, src/script/gen2/Specials.lua SetDayOfWeek)
 -- and World only ever reads it.
 
+local Palettes = require("src.world.gen2.Palettes")
 local Runtime = require("src.mods.Runtime")
+local Strings = require("src.core.Strings")
 
 local Clock = {}
 
 Clock.MINUTES_PER_DAY = 24 * 60
 Clock.DAYS = 7
 
+-- data/text/day_of_week.asm order, which is wCurDay's own: SUNDAY is 0, so
+-- index 1 is SUNDAY -- matching both InitClock's `self.day + 1` and
+-- `Clock.weekday(save) + 1`.  Strings.source, not Strings: built at require
+-- time, before Strings.load has a catalog, so Clock.weekdayName looks each
+-- name up at display time instead (src/battle/MoveEffects.lua's STAT_LABEL
+-- is the same pattern).  One shared table and one lookup function, so
+-- InitClock's screens, the main menu clock box and the Pokegear clock card
+-- cannot drift apart on what a weekday is called.
+Clock.DAY_NAMES = {
+  Strings.source("SUNDAY"), Strings.source("MONDAY"), Strings.source("TUESDAY"),
+  Strings.source("WEDNESDAY"), Strings.source("THURSDAY"), Strings.source("FRIDAY"),
+  Strings.source("SATURDAY"),
+}
+
+-- The translated name for a 1-based weekday (SUNDAY = 1), or nil if `day` is
+-- out of range.
+function Clock.weekdayName(day)
+  local name = Clock.DAY_NAMES[day]
+  return name and Strings(name)
+end
+
+-- The three words Palettes.clockDaytime can hand back, translated (never
+-- DARK: that one only comes out of Palettes.daytimeFor, for a PALETTE_DARK
+-- map, and is never printed as text).  Strings.source, not Strings:
+-- clockDaytime's return value is also an internal key every
+-- FORCED_DAYTIME/palette lookup in Palettes.lua compares against, so THAT
+-- stays untranslated -- only this table, and Clock.daytimeLabel below, look
+-- a word up, at the UI call sites that actually print it.
+local DAYTIME_LABEL = {
+  MORN = Strings.source("MORN"), DAY = Strings.source("DAY"),
+  NITE = Strings.source("NITE"),
+}
+
+-- clockDaytime's word, translated -- the one InitClock's clock-setting
+-- screen and the Pokegear's clock card print (DisplayHourOClock /
+-- Pokegear_UpdateClock).
+function Clock.daytimeLabel(hour)
+  local daytime = Palettes.clockDaytime(hour)
+  return Strings(DAYTIME_LABEL[daytime] or daytime)
+end
+
 -- InitClock's own default: `ld a, 10 ; default hour = 10 AM`, with the minute
 -- buffer left at the zero ByteFill put there.
 Clock.DEFAULT_HOUR = 10