Update from upstream (#27)

Update de.po (321)

Implement use element with handles (1324)

Fix elliptical arc rare visual issue (1327)

Fix glitchy handle movement on android (1329)

Fix tab staying empty on first open (1330)

No max scale 5% rounding (1331)

Fix edge case in rect drawing (1333)

Add Spanish translation (1332)

Fix comma parsing in transform lists (1334)

Hide GUI aspects for invalid elements (1335)

Add icon for the use element (1336)

Implement importing multiple files at once (1337)

Fix dimensionless SVG editing (1338)

Some codebase comments (1339)

Updated Estonian translations (1340)

Speed up tab bar scrolling and use factor (1341)

Update Ukrainian and Russian translations (1344)

Fix SVG reference image regression (1345)

Update translations for portuguese brazillian (1346)

Fix tab corruption bug (1347)

Author: syntaxerror247