add symbolic link from sonar-web to core.properties

diff --git a/server/sonar-web/core.properties b/server/sonar-web/core.properties
new file mode 120000 (symlink)
index 0000000..e4e903e
--- /dev/null
+++ b/server/sonar-web/core.properties
@@ -0,0 +1 @@
+../../sonar-core/src/main/resources/org/sonar/l10n/core.properties
\ No newline at end of file