eo-ZZ: reword "Loading..."-style messages into verbal nouns

[slashdevslashurandom]

A quite small PR this time. This one rewords messages indicating an ongoing action from a present-tense verb into a verbal noun.

The goal is to make the translation a bit more formal. Instead of having the program "speak for itself" with an implied first person pronoun, the ongoing action is described as a noun. From my experience, this matches with how other European languages handle such strings.

For instance, when it comes to Microsoft software (which, at least until the 2010s, seems to have maintained a high standard for localization, at least in my experience), phrases that start with "Downloading..." in English are generally translated using "Загрузка..." and "Téléchargement..." in Russian and French, using their respective verbal nouns, whereas in German the action is instead written in passive voice with "...(wird/werden) heruntergeladen" ("...(is/are) being downloaded").

Likewise, Firefox's Esperanto localization seems to mostly use either the Russian/French approach ("Elŝuto..."/"Elŝutado...") or the German one ("...estas elŝutata").

cc @tellovishous

[github-actions]

Check results

For details click the build job and expand Run checks on the CI logs.

	Missing The translation is not added to translation file. (e.g. STR_9999 is in en-GB but is not available in given language)	Not needed The translation file contains entries that are not in en-GB and should be removed (e.g. STR_9999 exists in given language but is not in en-GB)	Same The translation and source string is exactly the same. (e.g. STR_9999 is Umbrella in both en-GB and given language). This may be desired in some cases (e.g. April is the same in English and German)
eo-ZZ	0	0	51

Other translations

	Missing The translation is not added to translation file. (e.g. STR_9999 is in en-GB but is not available in given language)	Not needed The translation file contains entries that are not in en-GB and should be removed (e.g. STR_9999 exists in given language but is not in en-GB)	Same The translation and source string is exactly the same. (e.g. STR_9999 is Umbrella in both en-GB and given language). This may be desired in some cases (e.g. April is the same in English and German)
ar-EG	289	0	1711
ca-ES	6	0	79
cs-CZ	15	0	130
da-DK	0	0	237
de-DE	0	0	132
en-US	3442	0	1
es-ES	17	0	150
fi-FI	113	0	81
fr-CA	3607	0	0
fr-FR	0	0	124
gl-ES	0	1	78
hu-HU	0	0	76
it-IT	38	0	122
ja-JP	113	0	100
ko-KR	0	0	76
nb-NO	198	0	153
nl-NL	0	0	169
pl-PL	6	0	85
pt-BR	0	0	123
ru-RU	1	0	100
sv-SE	26	0	145
tr-TR	524	0	91
uk-UA	194	0	700
vi-VN	43	0	101
zh-CN	26	0	22
zh-TW	62	0	90

[tellovishous]

Seems reasonable enough, looks good to me 👍