Server crashes with StringIndexOutOfBoundsException when processing Macedonian (mk) templates using 'Шаблон:' namespace

[haniyakonain]

Describe the bug
Server crashes during startup with StringIndexOutOfBoundsException when processing Macedonian (mk) language template redirects. Many Macedonian Wikipedia templates use 'Шаблон:' (Cyrillic for "Template") instead of the expected 'Предлошка:' namespace prefix, causing the substring operation to fail with index -1.

The crash occurs at:

java.lang.StringIndexOutOfBoundsException: String index out of range: -1
        at java.lang.String.substring(String.java:1931)
        at org.dbpedia.extraction.server.stats.MappingStatsHolder$$anonfun$1.apply(MappingStatsHolder.scala:54)

Over 100+ mk templates are affected, including:

• Шаблон:Инфокутија Верски објект
• Шаблон:2TeamBracket
• Шаблон:Инфокутија Православна црква
• Шаблон:Оклопно возило
• And many more...

Expected behaviour
The server should either:

1. Handle alternative namespace prefixes for mk language (recognizing both 'Предлошка:' and 'Шаблон:')
2. Log warnings and skip invalid templates without crashing (PR #795 provides a temporary fix for this)
3. Successfully start and process mk language templates without throwing exceptions

Environment

• Extraction: (commit hash): 5eb208b932a63a6f0cd5cbede3e446315686e6a7 (enable-wikidata-server branch)
• OS: Linux 6.14.0-33-generic (Ubuntu)
• Java SDK Version (java --version): 1.8.0_462 (OpenJDK)
• Maven version (mvn --version): Apache Maven 3.8.7

To reproduce

1. Enable Macedonian (mk) language in server.default.properties with @mappings or any configuration
2. Start the DBpedia extraction server: cd server && ../run server
3. Server attempts to load mk template statistics
4. Server crashes with StringIndexOutOfBoundsException during MappingStatsHolder initialization

Additional context & logs
The root cause is in MappingStatsHolder.scala:54 where the code expects all templates to start with 'Предлошка:' but many mk templates use 'Шаблон:'.

Related:

• PR #795 fixes the crash by adding validation but doesn't address the namespace mismatch
• This may require updating the mk language configuration to recognize 'Шаблон:' as a valid template namespace

Full stack trace:

org.dbpedia.extraction.server.stats.MappingStatsHolder$$anonfun$apply$2 apply
WARNING: mk template 'Шаблон:Инфокутија Верски објект' does not start with 'Предлошка:'
[... 100+ similar warnings ...]

java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at scala_maven_executions.MainHelper.runMain(MainHelper.java:164)
        at scala_maven_executions.MainWithArgsInFile.main(MainWithArgsInFile.java:26)
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: -1
        at java.lang.String.substring(String.java:1931)
        at org.dbpedia.extraction.server.stats.MappingStatsHolder$$anonfun$1.apply(MappingStatsHolder.scala:54)
        at org.dbpedia.extraction.server.stats.MappingStatsHolder$$anonfun$1.apply(MappingStatsHolder.scala:54)
        at scala.collection.MapLike$FilteredKeys$$anonfun$foreach$1.apply(MapLike.scala:231)
        [...]