[BUGFIX] Do not set L parameter in case of linking to same language

[maikschneider]

Currently, the L parameter is always appended to links for both pages and content elements. However, this behavior is problematic when the source and target languages are identical.

When the language parameter is unnecessarily added, the target language becomes fixed, which is unintended. During record translations, links may point to the wrong language.

This PR introduces a check to compare the source and target languages. The L parameter will now only be added if the languages differ, ensuring links behave as expected during translations.

resolves #25

[sorenmalling]

This will also fix the issue that Linkvalidator can not match links to content elements.

The class TypolinkTagSoftReferenceParser::parse method uses a preg_match('/page\?uid=(\d+)#?(\d+)?/', $matches[1]) way to check if a links i broken (A content element is hidden/deleted).

When link2language builds a link it comes out as <a href="t3://page?uid=2879&amp;L=1#23260"> and the &L=1 break the match and ends up not returning the id of the content element

Compared to without the L parameter