Adds a std::map<std::string, std::string> with display names for language codes not given by libicu
Fault language codes are taken from library.kiwix.org
The HumanReadableId can contains special char (`&`/`=`/...)
As it is used as to create a url in the opds template,
we must url encode it.
- We don't need to encode the book id as it is a uuid, it never contains
special char.
- We don't need to encode the book url as it is read from the library and
the url must already be correctly encoded in the library.xml.
(tests modified accordingly)
As we render the entry's xml in a separated steps, we need to pass the
rootLocation to all the internal rendering.
Testing with and without root is not so easy.
I've simply made all server tests using a ROOT prefix.
We can assume that if the ROOT is present everywhere we need it, it will not
when we don't need. (As long as we don't hardcode "ROOT" in the server.)
Deduplicated the mustache templates static/templates/catalog_v2_entries.xml
and static/templates/catalog_v2_complete_entry.xml (the latter was
renamed to static/templates/catalog_v2_entry.xml).
Language code to human friendly name translation is now done with the
help of the ICU library. It works if the line
```
-include $(LANGSRCDIR)/resfiles.mk
```
in the file `source/data/Makefile.in` of the icu4c dependency is not
commented out. Currently, the said line is commented out (along with
some other include's) by the `icu4c_custom_data.patch` patch of the
`kiwix-build` tool.
This changes the output of `/catalog/search` as follows:
- Entire search query (rather than only the value of the `q` parameter)
is put in the <title> node.
- Search performed with an empty query presents itself as "All zims".
- The feed id remains stable for identical searches on the same
library.
No real change. Reordering setting and dumping of attribute in the same
order (mostly) they are declared in book.h make it easier to detect missing
attribute.
The `common` name is from the time where kiwix was only one repository
for all the project (android, desktop, server...).
Now we have split the repositories and kiwix-lib is the "common" repo,
the "common" directory is somehow nonsense.
It is up to the book to manage its attribute.
Also remove the `absolutePath` (and `indexAbsolutePath`). The `Book::path` is always stored
absolute.
The fact that the path can be stored absolute or relative in the
`library.xml` is not relevant for the book.