Fix: Translate remaining English log messages to Slovak

- validateInput.js: validation error messages
- errorHandler.js: unhandled error message
- validateBody.js: suspicious input message
- crm-email.controller.js: error log messages

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/controllers/crm-email.controller.js

@@ -105,7 +105,7 @@ export const getUnreadCount = async (req, res, next) => {
       },
     });
   } catch (error) {
-    logger.error('ERROR in getUnreadCount', { error: error.message });
+    logger.error('Chyba v getUnreadCount', { error: error.message });
     next(error);
   }
 };
@@ -165,7 +165,7 @@ export const syncEmails = async (req, res, next) => {
         totalSynced += total;
         totalNew += saved;
       } catch (syncError) {
-        logger.error('Failed to sync emails for contact', { contactEmail: contact.email, error: syncError.message });
+        logger.error('Nepodarilo sa synchronizovať emaily pre kontakt', { contactEmail: contact.email, error: syncError.message });
       }
     }
 
@@ -261,7 +261,7 @@ export const markContactEmailsRead = async (req, res, next) => {
       data: { count },
     });
   } catch (error) {
-    logger.error('ERROR in markContactEmailsRead', { error: error.message });
+    logger.error('Chyba v markContactEmailsRead', { error: error.message });
     next(error);
   }
 };
@@ -444,7 +444,7 @@ export const searchEmailsJMAP = async (req, res, next) => {
       data: results,
     });
   } catch (error) {
-    logger.error('ERROR in searchEmailsJMAP', { error: error.message });
+    logger.error('Chyba v searchEmailsJMAP', { error: error.message });
     next(error);
   }
 };