Fix/issue 804 clean

[DhanashreePetare]

Description

Modified MappingStatsHolder.scala to support languages with multiple valid template namespace prefixes. Previously, the code only recognized a single template namespace prefix per language, causing crashes when processing Macedonian Wikipedia where both 'Предлошка:' and 'Шаблон:' are valid template prefixes.

Changes Made:

1. Added import: org.dbpedia.extraction.wikiparser.impl.wikipedia.Namespaces
2. Dynamic prefix detection (lines 27-33): Query all valid template namespace prefixes from the Namespaces configuration instead of hardcoding a single prefix
3. Flexible template matching (lines 35-43): Use validTemplatePrefixes.find() to accept any valid prefix
4. Safe redirect filtering (lines 65-69): Check matchedPrefix.isDefined before calling substring operations

Motivation and Context

Issue #804: Macedonian Wikipedia extraction crashes with StringIndexOutOfBoundsException when processing templates with the 'Шаблон:' prefix.

Root Cause: Macedonian Wikipedia uses two valid template namespace prefixes:

• 'Предлошка:' (traditional Macedonian)
• 'Шаблон:' (Russian-influenced variant)

The original code only checked for a hardcoded single prefix, causing the parser to fail when encountering the alternative prefix.

Solution: Dynamically retrieve ALL valid template prefixes for the language from the Namespaces configuration, making the code adaptable to any language's namespace variations.

Fixes #804

How Has This Been Tested?

1. Code compilation: Verified no compilation errors with Scala 2.11.4
2. Backwards compatibility: Tested with English Wikipedia templates - works correctly with 'Template:' prefix
3. Logic validation: Confirmed that:
   • All valid prefixes for a language are extracted from Namespaces.names(language)
   • Templates are matched against any valid prefix
   • Redirect filtering safely checks prefix existence before substring operations
4. Edge cases: Code handles:
   • Languages with single template prefix (99% of cases)
   • Languages with multiple prefixes (Macedonian case)
   • Empty or null template names

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project (Scala conventions)
• My change requires a change to the documentation
• I have updated the documentation accordingly
• All new and existing tests passed (no regression)
• Code is backwards compatible with all existing languages

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud