[i18n] Enable more languages (#9082)

Croatian (hr)
Finnish
Lithuanian

Georgian (ka)
Hindi
Serbian

Follow-up to <https://github.com/koreader/koreader/pull/9079>.

Croatian is 46% done, the others mostly 10-20%.

frontend/ui/language.lua

@@ -12,12 +12,14 @@ local Language = {
         eo = "Esperanto",
         es = "Español",
         eu = "Euskara",
+        fi = "Suomi",
         fr = "Français",
         gl = "Galego",
         it_IT = "Italiano",
         he = "עִבְרִית",
+        hr = "Hrvatski",
         hu = "Magyar",
-        ka = "ქართული",
+        lt_LT = "Lietuvių",
         lv = "Latviešu",
         nl_NL = "Nederlands",
         nb_NO = "Norsk",
@@ -37,10 +39,13 @@ local Language = {
         bn = "বাংলা",
         el = "Ελληνικά",
         fa = "فارسی",
+        hi = "हिन्दी",
         ja = "日本語",
+        ka = "ქართული",
         kk = "Қазақ",
         ko_KR = "한글",
         ru = "Русский",
+        sr = "Српски",
         uk = "Українська",
         zh = "中文",
         zh_CN = "简体中文",
@@ -121,10 +126,13 @@ function Language:getLangMenuTable()
                 self:genLanguageSubItem("eo"),
                 self:genLanguageSubItem("es"),
                 self:genLanguageSubItem("eu"),
+                self:genLanguageSubItem("fi"),
                 self:genLanguageSubItem("fr"),
                 self:genLanguageSubItem("gl"),
+                self:genLanguageSubItem("hr"),
                 self:genLanguageSubItem("it_IT"),
                 self:genLanguageSubItem("hu"),
+                self:genLanguageSubItem("lt_LT"),
                 self:genLanguageSubItem("lv"),
                 self:genLanguageSubItem("nl_NL"),
                 self:genLanguageSubItem("nb_NO"),
@@ -145,10 +153,13 @@ function Language:getLangMenuTable()
                 self:genLanguageSubItem("el"),
                 --self:genLanguageSubItem("fa"),
                 self:genLanguageSubItem("he"),
+                self:genLanguageSubItem("hi"),
                 self:genLanguageSubItem("ja"),
+                self:genLanguageSubItem("ka"),
                 --self:genLanguageSubItem("kk"),
                 self:genLanguageSubItem("ko_KR"),
                 self:genLanguageSubItem("ru"),
+                self:genLanguageSubItem("sr"),
                 self:genLanguageSubItem("uk"),
                 --self:genLanguageSubItem("zh"),
                 self:genLanguageSubItem("zh_CN"),