589 translation fixes for v130

[SanderDevisscher]

This pull request updates the export instructions for graphs and maps in the FAQ pages and translation files, and improves the translation and terminology for "observations" to "occupancy/distribution" across Dutch, French, and English. It also adds or updates several translation keys, including new TODO placeholders for missing translations.

Key changes:

1. Updated export instructions in FAQ pages:

• Clarified and unified instructions for exporting charts and maps as images in English, French, and Dutch FAQ HTML and Rmd files, specifying both the new 'download graph' button and the existing 'camera' icon method. [1] [2] [3] [4] [5] [6]

2. Improved terminology and translations for "observations"/"occupancy":

• Changed references of "observations" to "occupancy" or "distribution" in translation CSV files for Dutch, French, and English, including updated descriptions and titles for graphs and maps. [1] [2] [3] [4]
• Updated y-axis labels for occurrence/occupancy graphs to use more accurate and localized terms. [1] [2] [3]

3. Added new translation keys and placeholders:

• Added new translation keys such as downloadData_title, downloadGraph_title, missingFilters_species_title, and others, with English, Dutch, and French translations or TODO placeholders. [1] [2] [3] [4] [5] [6] [7] [8] [9]

4. Minor translation improvements and consistency:

• Improved phrasing and consistency in map and chart descriptions, and updated explanatory text for time series graphs and map legends in all three languages. [1] [2] [3]

These changes ensure clearer user instructions, more accurate and consistent terminology, and better support for future translation improvements.

[soriadelva]

Ipv natuurlijke arealen zou ik Alle oorspronkelijke verspreidingsgebieden gebruiken

[SanderDevisscher]

Ik heb er "Alle oorspronkelijke herkomsten" van gemaakt. Dit vooral omdat de tekst in een filter vak moet passen. deze optie is zelf aan de lange kant!

these remarks are fixed