make pull-tx drops translated strings

[strk]

As of commit [b67f6c80f24edb57fa223a2065c2255bbb346cef/git] running make pull-tx results in removal of translated strings in some files.

Example:

--- a/doc/po/de/introduction.xml.po
+++ b/doc/po/de/introduction.xml.po
@@ -66,13 +66,6 @@ msgid ""
 "(coverages, surfaces, networks), data source for desktop user interface "
 "tools for viewing and editing GIS data, and web-based access tools."
 msgstr ""
-"Die PostGIS Project Develpment Group beabsichtigt durch die Unterstützung "
-"und Weiterentwicklung von PostGIS eine hohe Funktionsvielfalt zu erreichen. "
-"Diese soll wichtige GIS-Funktionalitäten, Kompatibilität mit den spatialen "
-"Standards OpenGIS und SQL/MM, hochentwickelte topologische Konstrukte "
-"(Coverages, Oberflächen, Netzwerke), Datenquellen für Desktop "
-"Benutzeroberflächen zum Darstellen und Bearbeiten von GIS Daten, sowie "
-"Werkzeuge für den Zugriff via Internettechnologie beinhalten."
 
 #. Tag: title
 #: introduction.xml:21

As I just pushed to transifex after the aforementioned commit I don't understand why would a pull drop those strings, unless someone really logged into Transifex to remove them, which is unlikely.

Other changes are the Last-Translator header, which goes to me (probably just because I was the last pusher) and removal of some fuzzy labels.

I wonder if what Transifex is doing is basically DROP the "fuzzy" strings, not trusting them (--no-fuzzy-matching switch used by Transifex use of msgmerge whereas our own update-po does not make use of that switch?)

[strk]

I tried using msgmerge --no-fuzzy-matching on my system but I still don't obtain the same result obtained from pulling from Transifex.

Weblate still has the removed-by-transifex strings: ​https://weblate.osgeo.org/translate/postgis/introductionxml/de/?offset=&q=Develpment+Group+beabsichtigt+durch&sort_by=-priority%2Cposition&checksum=

But also Transifex seems to know about them: ​https://www.transifex.com/postgis/postgis/translate/#de/introductionxmlpot_1/179231423?q=text%3A'coverages%2C+surfaces%2C+networks'

[strk]

I found the reason for this being that our make pull-tx does NOT pass a --mode switch to tx commandline, which by default means --mode developer, which in turn does NOT download translation which were NOT reviewed.

For switching to weblate we probably want to fetch more strings. Available modes are documented in ​https://docs.transifex.com/client/pull/

I'll experiment some with different modes to try at finding something that works for us w/out introducing too many conflicts

[strk]

I tried different modes but none of them give us what we need. I guess the only proper solution is fetching the transifex files with untranslated string empty and then use msgcat to merge the transifex one and our one: ​https://phrase.com/blog/posts/combine-po-translation-files/

[strk]

With commit [26d51b23a1f967771df731b91bba5fd5e3cd735e/git] I removed the Transifex support from our build scripts, so this is going to be a wontfix