refactor: replace numeric translation keys with named keys

- Extract shared i18n.sh library with tr() function (replaces 5 duplicated text_lang functions)
- Replace numeric IDs (001, 002, ...) with human-readable keys (already_started, delete, etc.)
- Update all language files (en_US, en_GB, de_DE) to use named key format
- Update all scripts (jdautoenc, rename, addrename, removerename, config) to use tr() from i18n.sh

config.sh

@@ -9,6 +9,8 @@ source "$(dirname "$0")/i18n.sh"
 
 # Funktion für später, um z.B. zenity statt whiptail zu nutzen.
 
+possiblelangfolder=$(find ~ -type f -wholename "*lang/$language/config.lang" 2>/dev/null | sed 's/en_US\/config.lang//g')
+
 if ! [ -f "$language_folder"/"$language"/config.lang ]; then
   real_language_Folder=$(whiptail --title "Could not find language folder" --inputbox "WARNING!! Language folder could not be found. Please type the Path to the language folder or else, the script will try to get the language from Github (could be buggy)\nPossible Path: $possiblelangfolder" 16 100 3>&1 1>&2 2>&3 | sed -e "s#/#\\\/#g")
   sed -i "s/language_folder=.*/language_folder=$real_language_Folder/g" "$JDAutoConfig"