Add ability to skip some <property> tags #14

Although it seemed that everything needed in the TDEL10n module was resolved, the more complex XML files in tdewebdev have shown that it is necessary to add support to skip the contents of some <property>…</property> tags as it does in the extractrc script.

At the same time, it was necessary to fix the extraction of the tag content, where tag is written as unpaired.

I'm sorry that this again will cause another large number of commits 😿

I tested updating templates in all modules, reviewed the changes, and did not find any undesirable side effect. There seem to be no problems that would prevent merging.

sounds good to me 👍