(some) XPath functions cannot be used

[cylkee]

Extension version: 1.3.3
Symphony: 2.7.10
PHP: 7.3.12
OS: Linux

I cannot use a simple translate() function in a section's Anchor URL (XPath expression) field. To ensure my expression was correct I copied it to a new Reflection Field (2.0.4), saved and it translated as expected.

If 90% of this extension's code is from Reflection Field, as the README states, then this is probably related to issues surrounding symphonists/reflectionfield#35