Fix l10n undefined nil reference crash when accepting new quests

Modules/QuestieInit.lua

@@ -416,7 +416,16 @@ function QuestieInit:LoadDatabase(key)
         -- This path is for legacy single-file DB format.  If we are on a
         -- modern client (WOW_PROJECT_ID is defined natively and not ancient), refuse
         -- and direct the user to reinstall the split-file DB instead.
-        local isModernClient = _G.WOW_PROJECT_ID ~= nil
+        local _, _, _, tocversion = GetBuildInfo()
+        local isModernClient = false
+        if tocversion then
+            if tocversion >= 100000 then isModernClient = true -- Retail
+            elseif tocversion >= 11300 and tocversion < 12000 then isModernClient = true -- Classic Era
+            elseif tocversion >= 20500 and tocversion < 30000 then isModernClient = true -- TBC Classic
+            elseif tocversion >= 30400 and tocversion < 40000 then isModernClient = true -- WotLK Classic
+            elseif tocversion >= 40400 and tocversion < 50000 then isModernClient = true -- Cata Classic
+            end
+        end
         if isModernClient then
             Questie:Debug(Questie.DEBUG_DEVELOP,
                 "[DBDiag] LEGACY DB ('" .. key .. "' is string) on modern client. "

Modules/QuestieLearner.lua

@@ -9,6 +9,8 @@ local QuestieQuest = QuestieLoader:ImportModule("QuestieQuest")
 local QuestiePlayer = QuestieLoader:ImportModule("QuestiePlayer")
 ---@type QuestLogCache
 local QuestLogCache = QuestieLoader:ImportModule("QuestLogCache")
+---@type l10n
+local l10n = QuestieLoader:ImportModule("l10n")
 
 local _Learner = QuestieLearner.private or {}
 QuestieLearner.private = _Learner
@@ -1254,7 +1256,6 @@ function QuestieLearner:OnMouseoverUnit()
     local zoneText = GetRealZoneText()
     local areaId = _Learner.zoneCache[zoneText]
     if not areaId then
-        local l10n = QuestieLoader:ImportModule("l10n")
         areaId = l10n:GetAreaIdByLocalName(zoneText)
         if areaId then
             _Learner.zoneCache[zoneText] = areaId